2012 SOUTHEASTERN NATURALIST 11(3):487–506
Food of the Armadillo Dasypus novemcinctus L. from
Cumberland Island, GA
John O. Whitaker, Jr.,1,* Carol Ruckdeschel2, and Laura Bakken1
Abstract - We provide a review of Dasypus novemcinctus (Nine-banded Armadillo)
food studies and report on the diet on Cumberland Island, GA. Major invertebrate foods
eaten by Armadillos on Cumberland Island were ants (19.3%); beetles, adults and larvae
(27.4 %); centipedes (6.5%); lepidopterans, mostly larvae (caterpillars, 13.2%); millipedes
(5.7%); spiders (2.1%); and sowbugs (2.2%). Vertebrates eaten (1.9% volume)
were mostly frogs and lizards. Plant material comprised about 12% of the volume, including
much fruit such as Melia azedarach (China Berry), Vitis (grapes), Ampelopsis
arborea (Pepper Vine), and Serenoa repens (Saw Palmetto). The subterranean fungi,
Endogonaceae, were eaten by 23.9% of the Armadillos, comprising 1.6% of the volume
of their diet. The millipede Narceus sp. appears to have been greatly reduced, based on
the significant reduction of this species as a component of the gut content over three decades.
This reduction could be due to Armadillo predation. Ants, scarabaeid adults and
larvae, and spiders also showed significant decreases during the period of study, which
could be a result of Armadillo predation. A number of items—elaterid larvae, crickets,
caterpillars, centipedes, sowbugs, and Endogonaceae—showed significant increases as
components of Armadillo stomachs, but it is not known whether these changes might be
related to Armadillo predation. The increases could have been due to other causes such
as habitat or climatic changes.
Introduction
There is relatively little detailed information on the food of Dasypus
novemcinctus L. (Nine-banded Armadillo; hereafter Armadillo) from barrier
islands or maritime forest ecosystems. Carol Ruckdeschel has been studying
the ecology of Cumberland Island since the early 1970s, and this paper constitutes
a part of that study. Armadillos are considered exotic in Georgia, and
were unrecorded in the US before 1849 (Humphrey 1974). They arrived in
Georgia from Mexico and south Texas, and from a few animals which escaped
confinement in Florida.
The Armadillo roots in the ground litter, pig fashion, by pushing forward
with its nose along the ground. We suspect that much of its food is detected by
olfaction. How much it uses its eyes and takes items off the surface is unknown.
Earthworms, ants, caterpillars, beetle larvae, Endogonaceae, and probably many
other foods are likely found by odor. Although we do not have estimates of availability
of the soil organisms, we suspect that the diets of Armadillos may give a
reasonable estimate of available soil organisms.
1Department of Biology, Indiana State University, Terre Haute, IN 47809. 2Cumberland
Island Museum, Cumberland Island, PO Box 7, St. Marys, GA 31558. *Corresponding
author - John.Whitaker@indstate.edu.
488 Southeastern Naturalist Vol. 11, No. 3
The Armadillo arrived on Cumberland Island, Camden County, in approximately
1973. The species was successful, increasing in numbers rapidly, and is
now abundant. It is a major predator on the invertebrates of the island, while it
has few predators, perhaps mainly Bubo virginiana Gmelin (Great Horned Owl)
and Alligator mississippiensis (Daudin) (American Alligator), and to a lesser
extent Lynx rufus (Schreber) (Bobcat) and Canis latrans Say (Coyote). One can
usually see several Armadillos as one walks along any of the trails in early morning,
late afternoon, or at night in summer, or at midday in winter.
Osborn et al. (2000) examined stomachs of 171 Armadillos from Cumberland
Island but identified only 18 foods. Major foods in all seasons were
beetle adults (especially Elateridae, Scarabaeidae, and Cicindelidae) and larvae
(especially Scarabaeidae and Elateridae), ants and wasps (all stages), and
lepidopteran larvae and pupae. Fruit was important only in August, the most
important being Vitus (grapes) and Serenoa repens (W. Bartram) Small (Saw
Palmetto), but Smilax sp. (greenbriar) and Prunus caroliniana (P. Mill.) Ait.
(Carolina Laurelcherry) were also eaten. Vertebrate prey included amphibians
(Scaphiopus holbrookii (Harlan) [Eastern Spadefoot]) and reptiles (Eumeces
sp., Anolis carolinensis (Voigt) [Carolina Anole], Sceloporus undulatus (Bosc
and Daudin in Sonnini and Latreille) [Eastern Fence Lizard], Opheodrys aestivus
(L.) [Rough Greensnake]) and their eggs.
Kalmbach (1943) recorded 488 different food items from 169 stomachs
of Armadillos from Texas, mostly from March through July. Insects formed
77.6% of the food items and 41.6% were beetles, the majority being adult
and larval scarabaeids. Carabids accounted for 9.4% of the total volume,
and were eaten by all but a few individuals. Hymenopterans, mostly ants,
were the second most important order, forming 14.0% of the diet, and nearly
every stomach contained ants. One individual had eaten 40,000 ants of 3 species.
Wasps, velvet “ants” (Mutillidae), digger wasps (Scoliidae), and paper
wasps (Vespidae) occurred occasionally. Caterpillars (mostly Noctuidae and
Notodontidae) occurred in 145 (85.7%) of the 169 stomachs, moths in only
10. Orthopterans (6.2%), most commonly roaches (Blattellidae, Ischnoptera
sp.), but also including crickets, grasshoppers, and walking sticks, were eaten
by all but 12 individuals. Termites (4.5%) were consumed in large numbers by
some individuals, and occurred in 126 (74.5%) stomachs. Hemiptera (2.0%)
were eaten by 128 (75.7%) of the Armadillos. Dipteran larvae accounted for
1.5% of the volume. Arachnids included spiders, scorpions, solpugids, ticks,
and mites. Millipedes and centipedes together accounted for 6.2% of the volume,
and were eaten by 89.3% of the 169 Armadillos examined. Earthworms,
most important in January, formed most of the 6.2% volume of “miscellaneous
invertebrates”. Crayfish, isopods, slugs, and snails were occasionally eaten.
Reptiles and amphibians formed 1.2% of the volume, but few Armadillos were
taken in winter, when Wirtz et al. (1985) and Sikes et al. (1990) found them
regularly eaten. Few birds or their eggs were eaten. Rubus (blackberries),
2012 J.O. Whitaker, Jr., C. Ruckdeschel, and L. Bakken 489
Morus (mulberries), Callicarpa (French mulberries), Prunus (plums), and Ilex
(holly) were eaten, and mushrooms and puffballs were heavily eaten by a few
individuals. Smith et al. (1998) found chitinase activity in this species, which
may aid in digestion of fungi, as well as insects and other arthropods.
Wirtz et al. (1985) examined 186 Armadillo stomachs from Florida and identifi
ed over 167,000 individual food items, more than half being ants. Insect larvae
were the dominant food throughout the year. Beetles were heavily eaten, with
25 families being found. The larvae of Elateridae and Scarabaeidae were most
important. Lepidopteran larvae, Orthoptera, and Diptera were important in all
seasons, and Homoptera, Hemiptera, Isoptera, and Dermaptera were eaten occasionally.
Spiders, centipedes, millipedes, and earthworms were also consumed.
Lizards and anurans were often eaten, especially in winter, when they were presumably
torpid and thus easy prey.
Nesbitt et al. (1979) examined stomachs from 172 Armadillos from Florida
and found insects comprising 78.5% by volume, with beetles, especially scarabaeids,
the largest component (29.7%). Hymenoptera (15.1%), Diptera (13.3%),
and Orthoptera (10.5%) were also important. Some economically important insects
found in these stomachs were Spodoptera frugiperda (J.E. Smith) (Fall
Armyworm), Pycnocelus surinamensis L. (Surinam Cockroach), and eggs of
Romalea microptera (Beauvois) (Lubber Grasshopper). Layne (1976) was
concerned that Armadillos might be a threat to Florida’s rare endemic reptiles,
noting that Sceloporus woodi Stejneger (Florida Scrub Lizard), Neoseps
reynoldsi Stejneger (Sand Skink), Rhineura floridana (Baird) (Florida Worm
Lizard), and Tantilla relicta Telford (Florida Crowned Snake) have been found
in Armadillo stomachs at the Archbold Biological Station. Staller et al. (2005)
found that the Armadillo was a major predator on eggs of Colinus virginianus
L. (Northern Bobwhite) in Florida and Georgia, and Douglass and Winegarner
(1977) found evidence that it commonly feeds on eggs of Gopherus polyphemus
(Daudin) (Gopher Tortoise) in southern Florida. Fitch et al. (1952) found
that the main foods of the Armadillo in Louisiana were beetles, but important
secondary foods were orthopterans and reptiles in winter, lepidopteran and dipteran
larvae in spring, and fruits in autumn.
Newman and Baker (1942) reported an Armadillo eating three young Sylvilagus
floridanus (J.A. Allen) (Eastern Cottontail). Hamilton (1946) found the
food of eight Armadillos in summer to be 80% Diospyros virginiana L. (Black
Persimmon) fruit. Taber (1945) found that Armadillos readily fed on maggotinfested
chickens but were slow to feed on fresh chickens. Clark (1951)
observed Armadillos tearing up paper nests of wasps, apparently to obtain the
larvae and pupae.
The purpose of the present study was to determine the diet of the Armadillo
over time on Cumberland Island, and to compare the results with other studies.
490 Southeastern Naturalist Vol. 11, No. 3
Materials and Methods
The Armadillos were collected by Carol Ruckdeschel and C.R. Shoop. A
total of 134 Armadillo stomachs was available, including samples from every
month: January (12), February (6), March (6), April (15), May (26), June
(23), July (6), August (10), September (15), October (6), November (7), and
December (2), in the years from 1975 through 2006. Most of the Armadillos
were found dead on the road or dead on the beach, and others were taken as
nuisance animals. The stomach was immediately removed from each Armadillo
and preserved in 70% alcohol, then sent to J.O. Whitaker, Jr. for analysis.
Original examination of the contents of a stomach generally took about one
day each. The stomach contents were put into a 0.8-mm mesh strainer to remove
detritus and small particles. The strained material was occasionally
examined to be sure that whole small organisms were not passing through the
strainer. The items were then sorted and counted, with different species or
species groups (such as ants) being put into different vials for further identification
to smaller taxonomic groups. The percent volume of each item in
each stomach was estimated visually. It was noted that many of the items were
whole or nearly so, even though they had passed through the mouth and had
presumably been processed by the teeth before entering the stomachs. The data
were summarized by adding all of the individual values for each item. Those
sums were divided by the total number of stomachs x 100 for each month and
for the overall estimate of percent volume during the study. Percent frequency
was calculated for each item as the percentage of the total number of stomachs
in which a given item occurred. The amounts of the various food items were
presented as total numbers and percentages.
Description of Study Area
Cumberland Island is the largest and southernmost of the barrier islands off
the coast of Georgia. It was designated a National Seashore in 1972, and part
of the island was established as a Wilderness Area in 1982. The island is about
27 km (17 miles) long and averages about 2.4 km wide. A few residents and
one active hotel were present before the Wilderness designation, and the National
Park Service maintains a few buildings and campgrounds. There is one
road running the length of the island, with several east–west roads connecting
habitats, from grassy temporary wetlands and dunes to upland maritime forest.
The island is surrounded by saltwater, but there is fresh groundwater from
rainwater retention.
There are some small ponds, creeks, swamps, and marshes, and the largest
natural freshwater lake occurring on any of the Georgia barrier islands. The major
portion of the island is maritime forest, with various live oaks, hickories, and
pines. Tillandsia usneoides (L.) L. (Spanish Moss) is abundant on the hardwoods
and would litter the ground if it were not for the feral livestock. Sabal palmetto
(Walt.) Lodd. (Cabbage Palm) and Saw Palmetto are very common in the understory
of the upland.
2012 J.O. Whitaker, Jr., C. Ruckdeschel, and L. Bakken 491
Feral horses and swine on Cumberland Island run freely, thus tramping
down the soil and litter and having a great impact on island ecology. Several
mammal species that are likely limited by the feeding and tramping of these
animals are shrews, arvicoline rodents, and Sigmodon hispidus Say and Ord
(Cotton Rat). Similar tramping has been shown to be detrimental to small
mammals in Indiana (Whitaker 1967). The droppings from feral livestock do
probably provide fertilizer and nurture a food chain that would benefit some
species. The heavy tramping and rooting probably limits the available food
for Armadillos as well.
Results and Discussion
Major food items eaten by Armadillos from Cumberland Island (Appendices
1, 2) were beetles (adults and larvae; 27.4% of total food volume), ants
(19.3%), caterpillars (11.5%), centipedes (6.5%), millipedes (5.6%), spiders
(2.1%), and sowbugs (2.2%). A few vertebrates were eaten (1.9% volume),
mostly lizards and their eggs. Various plant materials were occasionally eaten,
principally fruit. Fungi in the Family Endogonaceae were often eaten, totaling
1.6% of the volume. Many of the foods, even larger ones, were not chewed
much, such as centipedes (6 or 7 cm in length), large lepidopteran larvae and
pupae, and large beetle larvae. In contrast, nearly all of the hundreds of adult
beetles were chewed and very few left whole. Large millipedes, Narceus sp.,
were cut into chunks.
Insects
Beetles and beetle larvae were taken throughout the year and included
many families (14 identified) and species. Particularly obvious was the large
carabid beetle, Calosoma scrutator Fabr. (Fiery Searcher). It appeared in
stomachs in every month, April through August, but was particularly abundant
in May. Adults of this species formed 2.4% of the volume of food over the
study. Its larvae were found in May, June, and July, and they formed 2.3% of
the total volume. Other carabids (412 individuals) were found in every month,
and made up 2.9% of the total volume. Scarabaeid beetles were found in stomachs
in all months except December (n = 2), and were especially abundant
April through June and again August through October. A total of 1547 adult
individuals were found, and they were included in 55.2% of the stomachs.
Their larvae (grub worms) were also abundant, especially during May through
October. Adult click beetles (Elateridae) were found in every month, and
their larvae (wireworms) were heavily eaten in all months. A few long-horned
beetles (Cerambycidae) were found, mostly in August. Numerous unidentified
coleopteran larvae occurred, especially from January through April, forming
0.9% of the total volume. A moderate number of rove beetles (Staphylinidae)
were in stomachs, the greatest number in May. Tenebrionids were commonly
found, especially in August through October.
492 Southeastern Naturalist Vol. 11, No. 3
Ants (Formicidae, Hymenoptera) were the most abundant organisms found,
with over 23,000 found in the 134 stomachs (x̅ = about 175 per stomach). They
formed 19.3% of the volume of food, and occurred in 128 of the stomachs
(95.5%). These included a large number of species. The ants were often obtained
from nests, since all stages of ants, including eggs, were represented in
stomach contents. A few stinging hymenopterans, including vespid wasps and
bees, were found.
Caterpillars (lepidopteran larvae) were heavily eaten by Armadillos in every
month of the year (x̅ = about 10 per stomach), formed about 11.5% of the volume,
and were found in 114 (85%) of the stomachs. Lepidopteran pupae occurred in
22% of the stomachs and formed 1.0% of the volume. A total of 2539 larvae, 113
pupae, and 338 adult moths were found. Termites (Isoptera) were also eaten, especially
from January through April. These were obviously obtained from termite
nests, as indicated by the large numbers and various stages present.
Orthopterans eaten were mostly crickets, including many field crickets (Gryllus
spp.) and a few little brown crickets (Nemobius spp.) Gryllus formed 3.1%
of the volume, occurring in 43.3% of the stomachs, and included 157 individuals.
Hemipterans and homopterans were found, but none were very abundant.
Relatively few dipterans were found, the most abundant being midge adults and
larvae (Chironomidae), cranefly larvae (Tipulidae), and unidentified larvae. The
Armadillos fed little on grasshoppers or dragonflies, presumably because they are
difficult to capture.
Other invertebrates
Centipedes (Chilopoda) and millipedes (Diplopoda) were heavily eaten
throughout the year. At least 3 species of centipedes were included and collectively
formed 6.5% of the food, were found in 78.4% of the Armadillos,
and were represented by 1019 individuals (x̅ = 7.6). There were also three
species of millipedes: a very large, dark-colored Narceus sp.; a small, dark
coiled one; and a flattened, colorful one. Many of the items were eaten mostly
intact, including all of the centipedes and millipedes except for Narceus sp.,
which was cut into chunks before swallowing. Millipedes (including Narceus
sp.) comprised 5.6% of the volume, and were represented by 1296 individuals
(x̅ = 9.6). Narceus sp. was found in 17.2% of the stomachs, other millipedes
in 62.7% of stomachs. Spiders occurred in relatively small numbers, but were
present throughout the year, forming 2.1% of the volume, with a total of 226
spiders in 59% of the the stomachs. Sowbugs (3 species) occurred in every
month but mostly in January through June. Earthworms and snails occurred in
relatively small numbers. Earthworms were found in 15.7% of the stomachs,
comprised 0.6% of the volume, and included 220 individuals.
Vertebrates
Relatively few vertebrates were eaten by Armadillos on Cumberland Island,
forming less than 2% of the volume. Various lizards and lizard eggs were the
2012 J.O. Whitaker, Jr., C. Ruckdeschel, and L. Bakken 493
most common, including anoles and skinks, followed by frogs and toads. Two
clutches of lizard eggs were found—probably of Sceloporus undulatus (Bosc &
Daudin) (Eastern Fence Lizard)—and most of the eggs were intact. Bird remains
were found in a few stomachs, and mammal remains in one. The vertebrates, of
course, may have been taken as carrion.
Plant materials and fungi
A variety of plant material was found, including various roots, leaves, fruit,
and seeds. Some of the fruits identified were Melia azedarach L. (China Berry,
0.4%); Vitus (grapes) and Ampelopsis arborea (L.) Koehne. (Pepper Vine)
(0.1%); and Diospyros virginiana L. (Persimmon, 6%). Fungal foods included
mushrooms and the tiny subterranean fungi in the Family Endogonaceae. Even
though the clumps (n = 133) are tiny, they comprised 1.6% of volume, and were
found in 32 of the stomachs.
Seasonal differences
Various beetles, ants, and caterpillars were found throughout the year (Appendix
1). Larger numbers were often taken in summer, such as with ants, of which
the largest numbers were eaten in April and summer. Centipedes, millipedes,
sowbugs, and spiders also were eaten almost throughout the year. The lists of
foods eaten by month are given in Appendix 1. The carabid larvae and adults
were taken from April through July. Some amphibians and reptiles were taken in
winter, with 6 being taken in January, 5 in February, and most of the rest in April
and May. Lizard eggs were eaten from April through September.
How do foods eaten by Armadillos on Cumberland Island compare to foods
eaten elsewhere by this species?
The total volume of insects eaten by Armadillos was 68.4% on Cumberland
Island (this study), 77.6% in Texas (Kalmbach 1943), and 78.5% in Florida (Nesbitt
et al. 1979). Beetles and their larvae and ants were the insects most often
eaten: beetles 27.4% and ants 19.3% on Cumberland Island, 41.6% and 14.3%,
respectively, in Texas. The most important beetles in most studies were scarabaeids,
elaterids, and carabids. Ants were found in almost every stomach from
Cumberland Island and in Florida (Wirtz et al. 1985) and comprised over half the
individuals in both the areas. Caterpillars were important diet items on Cumberland
and from Florida, and were found in 85.7% of the stomachs from Texas, but
adult moths made up little of the food in any of the studies. Orthopterans, mostly
crickets and roaches, made up 5.1% of the volume of food on Cumberland Island,
6.2% of the food volume in Texas, and were major items in Florida (Wirtz et al.
1985). Millipedes and centipedes made up 9.1 and 2.7%, respectively, of the
food on Cumberland Island, totaled 6.2% in Texas (Kalmbach 1943), and were
important in Florida (Wirtz et al. 1985). Reptiles and amphibians, mostly lizards,
formed a small amount of the food in nearly every study. Plant materials and
fungi comprised 12% of the volume of food on Cumberland Island and made up
small amounts in the rest of the study areas.
494 Southeastern Naturalist Vol. 11, No. 3
Armadillos feed on a variety of available items, and there is great similarity in
the items of foods heavily eaten in the various study areas. There was no major
item eaten on Cumberland Island that was not eaten elsewhere. Fungi of the family
Endogonaceae formed 1.6% of the diet on Cumberland Island, but were not
reported elsewhere. However, fungi are overlooked by most workers. The large
carabid beetle, Calosoma scrutator, was apparently sharply declining from the
1980s through the turn of the century (this study) and was not found by Osborn
et al. (2000) on Cumberland, further indicating it has nearly disappeared from
Cumberland. Also it has not been previously reported from Camden County.
There is much similarity in the foods from various regions and relatively few
major differences.
Impact of Armadillos on the invertebrate community
To determine whether predation by Armadillos has resulted in changes in
abundances of prey species, we divided the food data into decades, primarily
the 1980s, 1990s, and 2000s. Three stomachs from the 1960s and 1970s were
included with data from the 1980s.
We examined the items in Appendix 2 and selected those that were large
enough in sample size to test. Using the data in Appendix 2, we calculated estimated
volumes that would be expected based on the percent of stomachs from
each decade (Table 1). If there was no change, then the actual volumes should
be similar to the expected numbers. Major differences would suggest changes in
invertebrate populations between the decades. Differences were tested for signifi-
cance using chi-square. Such differences, of course, might be due to factors other
than Armadillo predation, such as climatological events, vegetative community
Table 1. Expected and actual values for numbers of individuals of selected foods of Nine-banded
Armadillo on Cumberland Island, GA.
1980s 1990s 2000s Total
No. stomachs examined 57 31 46 134
% of stomachs 42.5 23.1 34.3
Prey Expected Actual Expected Actual Expected Actual
Scarab adult 247 307 134 153 199 121
Scarab larvae 187 252 102 50 151 139
Calosoma scrutator adult 132 299 72 24 107 0
Calosoma scrutator larvae 131 263 24 48 106 1
Elateridae larvae 290 188 159 165 236 336
Ants 11,053 12,800 6011 9500 8920 3684
Gryllid larvae 180 121 98 97 145 205
Lepidoptera 654 538 356 422 528 579
Chilopoda 369 377 201 127 298 364
Narceus sp. 103 168 56 70 83 5
Diplopoda 216 104 118 85 175 320
Sowbug 105 95 57 26 84 125
Earthworm 61 65 33 7 49 71
Endogonaceae 89 40 49 73 72 97
2012 J.O. Whitaker, Jr., C. Ruckdeschel, and L. Bakken 495
changes such as those resulting from the listing as a National Seashore, and cumulative
changes resulting from feral livestock, or to the presence of the fire ant.
The most obvious change between decades was that of the millipede Narceus
sp. Its numbers observed over the three decades were 168, 70, and 5 (Table 1).
Expected values based on the numbers examined in the three decades were 103,
56, and 83, and these differences were significant (chi-square = 117.8). It is possible
that the reduced numbers through time were due to the Armadillos, as these
millipedes are large and often conspicuous. Also interesting was that the other
millipedes were taken in significantly greater numbers (chi-square = 187.37) over
the three decades, 104, 85, and 320 (expected values 216, 118, and 175). We do
not know the ecological relationships between Narceus sp. and the other millipedes,
but it is possible that the decrease in Narceus sp. led to the increase in the
other millipedes.
Of the other forms tested, ants (31.45), scarabaeid adults (47.83), scarabaeid
larvae (50.05), and spiders (23.8) showed significant decreases in numbers (respective
chi-square values in parentheses), which may be a result of Armadillo
predation. Ants are abundant, and since ants are the major food of Armadillos
on Cumberland Island, it is logical that they might have diminished, although it
would be difficult to prove that the decrease was because of Armadillos.
There are relatively few earthworms on Cumberland Island, with only 65,
7, and 51 being taken over the three decades as compared to expected numbers
of 52, 28, and 42. Relatively greater numbers of earthworms were eaten during
the middle rather than in the earlier or later decades. These numbers were signifi
cantly different from random (chi-square = 85.6). Perhaps earthworms were
increasing on Cumberland Island until the advent of the Armadillos, and the
Armadillos might at that time have begun to have a negative influence on them,
but this does not explain their increase in the third decade. Perhaps climatologic
conditions could have played a role.
Other items—wireworms (elaterid larvae) (81.22), crickets (44.14), caterpillars
(27.1), centipedes (42.03), sowbugs (37.8), and the underground fungi
Endogonaceae (117.8)—all showed significant increases. It is unclear how
increases in any of these invertebrates might have been related to Armadillos.
Contrary to what happened in other groups, the larval elaterids increased, whereas
the adults showed no change. This is hard to explain. However, there is a large
number of species in this family, and adults are not eaten in large numbers (only
118 in stomachs in the three decades). Perhaps many of the adults are in different
habitats and thus less available to the Armadillos, or it may be, as indicated
by the small numbers eaten, that adult click beetles are not as appealing to the
Armadillos as food as are the larvae.
Fungi of the family Endogonaceae look like tiny clods of dirt at low power
of the dissecting scope, and are probably often overlooked. However, at powers
above 40x they look like tiny clusters of grapes, with each sporocarp
being stalked. It was surprising to find these fungi being eaten by Armadillos,
as they are so small. It might be suspected that they were taken incidentally
496 Southeastern Naturalist Vol. 11, No. 3
with some other food item. However, they are heavily eaten and presumably
desired by some small mammals. For example, Endogonaceae formed about
16.5% of the diet of Zapus hudsonius Zimmermann (Meadow Jumping
Mouse) and about 33.3% of the diet of Napaeozapus insignis (Miller) (Woodland
Jumping Mouse), both in central New York (Whitaker 1963a, b). Also it
formed about 3.8% of the diet of Blarina carolinensis (Bachman) (Southern
Short-tailed Shrew) on Cumberland Island (Whitaker and Ruckdeschel 2006).
These species clearly seek it as food, as sometimes as much as 100% of their
food is of this item. We suspect that the Armadillo found this food by scent
since we see no other food with which it might be ingested, and since it was
taken so often. These fungi produce odor attractive to mammals, which then
disperse the spores through defecation. Therefore it is logical to think that
these fungi may have increased by being eaten and their spores dispersed by
Armadillos, especially as the Armadillo is more wide-ranging than the Southern
Short-tailed Shrew.
Many kinds of ground beetles, Carabidae, were eaten, and populations of
these showed no significant difference over the three decades (chi-square =
1.78), except for Calosoma scrutator. It is large (25–36 mm) and showy, having
the head, prothorax, and elytra blackish but edged with greenish and gold. Both
adults and larvae decreased radically during this study. In the first decade, 299
adults were eaten, 24 in the second decade, and none in the third decade, as opposed
to 132, 72, and 107 expected. This difference was significant (chi-square
= 12,548). Correspondingly, 263, 48, and 1 larvae of this species were found
among the Armadillo prey in the three decades, as opposed to expected numbers
of 131, 24, and 106. This difference also was significant (chi-square = 243). We
suspect that numbers of this interesting carabid could have been reduced by the
Armadillo over this period.
We conclude that Armadillos are relatively unselective feeders and that information
on their food gives a fairly good sampling of the soil invertebrates on
Cumberland Island. This, in turn, can suggest whether foods are increasing, decreasing,
or remaining stable. In addition, population sizes of some of their prey
may be influenced by Armadillos, although there may be other factors influencing
them, such as (1) feral livestock—pigs and horses; (2) the current long-term
drought in southern Georgia; and (3) the recent arrival of fire ants, whose relation
to insects and other biota is unknown.
In some areas, Armadillos can cause damage such as destruction of quail
eggs and poultry, burrowing damage to structures, damage to crops and gardens,
and predation on reptiles and amphibians. On Cumberland Island, many of the
perceived negative effects are unlikely because most of the area is in Wilderness.
However, coupled with feral swine and horses, they could impact shorebird
nesting. Possible good effects of Armadillos are that their burrows can be used
by other animals such as Alligator mississippiensis (Daudin) (American Alligator),
rattlesnakes, opossums, cottontails, skunks, Neovison vison (Schreber)
2012 J.O. Whitaker, Jr., C. Ruckdeschel, and L. Bakken 497
(American Mink), and Ondatra zibethicus (L.) (Muskrat), and that they stir and
aerate the soil.
Acknowledgments
Linda Castor did most of the calculations. C. Robert Shoop helped with the collection
of Armadillos.
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2012 J.O. Whitaker, Jr., C. Ruckdeschel, and L. Bakken 499
Appendix 1. Foods (% volume, frequency) eaten by 134 Nine-banded Armadillos on Cumberland Island, GA, with summarized data for all stomachs (total).
Percent volume Frequency
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total Total Percent
n 12 6 6 15 26 23 6 10 15 6 7 2 134
Coleoptera (27.4)
Scarabaeidae – adult 1.8 2.3 0.5 6.4 7.4 4.5 0.5 3.8 4.9 5.3 0.7 0 4.3 74 55.2
Scarabaeidae – larvae 2.2 0 0.3 0.7 0.9 5.4 8.2 11.3 3.0 3.2 2.3 6.5 3.3 58 43.3
Carabidae 8.3 4.8 3.3 3.9 1.2 2.0 0.3 1.0 2.1 4.5 3.4 6.5 2.9 59 44.0
Calosoma scrutator – adult 0 0 0 0.4 9.7 2.0 2.3 0.5 0 0 0 0 2.4 27 20.1
Calosoma scrutator – larvae 0 0 0 0 11.4 0.5 0.8 0 0 0 0 0 2.3 18 13.4
Elateridae – adult 0.4 0.7 1.2 0.8 0.8 1.9 1.5 0.5 0.1 0.5 0.9 2.0 0.9 54 40.3
Elateridae – larvae 10.2 7.3 10.2 6.5 2.7 2.3 2.2 2.1 5.7 5.0 9.0 15.0 5.1 108 80.6
Buprestidae 0 0.3 0 0 0 0 0 0 0 0 0 0 0.01 1 0.07
Cicindellidae 0 0.5 0 0 0 0 0 0 0 0 0 0 0.0 1 0.07
Cerambycidae 0 0 0 0 0 0.04 0 2.3 0 0 0 0 0.2 4 29.8
Hydrophilidae 0 0 0 0 0 0.04 0 0 0 0 0 0 0.007 1 0.07
Scaphididae 0 0 0 0.07 0 0 0 0.8 0 0 0 0 0.07 2 1.5
Cantheridae 0 0 0 0 0 0 0 0 0 0 0.3 0 0.01 1 0.07
Cantherid larvae 0 0 0 0 0.04 0 0 0.1 0 0 0 0 0.01 2 1.5
Staphylinidae 0.3 0.3 0.2 0 1.1 0.09 0 0.5 0.1 0 0.1 0 0.3 18 13.4
Tenebrionidae 0.3 0.2 0 0 0 0.7 0 2.2 3.1 2.8 0.4 0 0.8 31 23.1
Dytiscidae 0 0 0.2 0 0 0 0 0 0 0 0 0 0.007 1 0.07
Chrysomelid larvae 0 0 0 0 0.04 0.09 0 0 0 0 0 0 0.02 2 1.5
Curculionidae 0.3 0 0 0 0 0.09 0 0.2 0.1 0 0 0.5 0.08 8 6.0
Unidentified Coleoptera adults 1.8 1.7 6.2 5.3 7.8 2.2 2.0 1.9 1.3 0 7.6 0.5 3.7 63 47.0
Unidentified Coleoptera larvae 1.5 2.5 3.2 1.3 0.3 1.6 0.2 0.7 0.3 0 0 0 0.9 21 15.7
Coleoptera pupae 0.4 0 0.5 0 0 0 0 0 0 0 0 0 0.06 2 1.5
Hemiptera (0.2)
Thyreocoridae 0 0 0.2 0 0 0.04 0 0.5 0.2 0 0 0 0.07 6 4.5
Pentatomidae 0 0 0 0 0 0.2 0 0 0.07 0 0 0 0.04 2 1.5
Cynidae 0.3 0 0.3 0 0 0 0 0 0 0 0 0 0.04 4 3.0
500 Southeastern Naturalist Vol. 11, No. 3
Percent volume Frequency
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total Total Percent
Pyrochroidae 0.3 0 0 0 0 0 0 0 0 0 0 0 0.02 1 0.07
Coreidae 0.3 0 0 0 0 0 0 0 0 0 0 0 0.02 1 0.07
Anasa tristis 0 0 0 0 0 0 0 0 0.07 0 0 0 0.007 1 0.07
Lygaeidae 0 0.3 0 0 0 0 0 0 0 0 0 0 0.01 1 0.07
Aphidoidea – green 0 0 0 0 0 0.04 0 0 0 0 0 0 0.007 1 0.07
Membracidae 0 0 0 0 0 0.04 0 0 0 0 0 0 0.007 1 0.07
Nabidae 0 0 0 0 0 0 0.2 0 0 0 0 0 0.007 1 0.07
Unidentified Hemiptera 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0.07
Homoptera (0.2)
Cicada 0 0 0 0 0 0 0 0.9 0 0.8 0 0 0.1 3 2.2
Cicada – large nymphal 0 0 0 0 0 0 0 0 0.5 0 0 0 0.06 1 0.07
Cicadellidae 0 0 1.0 0.07 0 0.09 0 0 0.07 0 0 0 0.08 4 3.0
Hymenoptera (19.4)
Formicidae 8.0 20.8 11.2 29.1 23.8 30.9 46.0 4.4 6.2 12.8 2.6 9.5 19.3 128 95.5
Bee 0 0 0 0 0.2 0.3 0 0 0 0 0 0 0.08 3 2.2
Vespidae 0.08 0 0 0 0 0 0 0 0 0 0.6 1.0 0.05 3 2.2
Orthoptera (5.1)
Gryllidae – Gryllus sp. 0.6 0 0.2 0.5 0.9 1.8 0.3 8.4 11.5 9.2 1.9 4.0 3.1 58 43.3
Gryllidae – Nemobius sp. 0 0.8 0 0 0.1 0 0 0 0 0 0 0 0.06 2 1.5
Blattellidae 0.6 0.5 0.7 0.4 0.4 0.3 0 0.3 6.2 0.7 0.3 0 1.0 32 24.0
Tettigoniidae 1.0 0 0 0 0.7 0.2 0 0 0.3 0.8 0 1.5 0.3 9 6.7
Acrididae 0 0.8 0 0.1 0 1.9 0 0 0 0 0 0 0.4 5 3.7
Rhaphidophoridae 0 0 0 0 0 0 3.7 0 0 0 0 0 0.2 3 2.2
Gryllotalpidae 0 0 0 0.3 0 0 0 0 0 0 0 0 0.03 2 1.5
Orthoptera – unidentified 0.2 0 0 0 0.08 0 0 0 0 0 0 0 0.03 4 3.0
Lepidoptera (13.2)
Lepidoptera – larvae 10.6 14.3 11.5 6.5 10.7 19.9 6.2 3.6 7.0 8.2 24.1 13.5 11.5 114 85.0
Lepidoptera – pupae 0.6 0.3 0.5 2.0 1.9 1.2 0 0.1 0.5 0.3 0.3 1.0 1.0 29 22.0
Lepidoptera – adult 0.2 0 0 6.3 0 0 0 0 0 0 0 0 0.7 1 0.07
2012 J.O. Whitaker, Jr., C. Ruckdeschel, and L. Bakken 501
Percent volume Frequency
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total Total Percent
Isoptera (1.4)
Isoptera – adult 0.2 10.7 7.2 3.3 0.3 0 0.8 0.6 0.07 1.0 0.3 0.5 1.4 23 17.2
Diptera (1.3)
Chironomidae 0 0 0 0 0 0 0 0 0 0 0.3 0 0.01 1 0.07
Chironomidae – larvae 0 0 0 0 0 0.09 0 0.2 0.1 0 2.9 0 0.2 7 5.2
Tipulidae – larvae 0.08 0 3.4 1.3 0.2 0 0 0.05 0.1 0 0.4 0 0.4 15 11.2
Stratiomyidae – larvae 0 0 0.2 0 0 0 0 0 0 0 0 0 0.007 1 0.07
Unidentified Diptera – adult 0 0 0 0.1 0 0 0 0 0 0.2 0 0 0.02 2 1.5
Unidentified Diptera – larvae 4.3 0 6.3 0.07 0.1 0.04 0 0 0.1 0 0.1 0 0.7 12 9.0
Dermaptera (0.02)
Dermaptera – adult 0 0 0 0 0 0.09 0 0.1 0 0 0 0 0.02 2 1.5
Odonata (0.2)
Anisoptera – dragonfly 0 0 0 0 0 0 0 0 1.3 0 0 0 0.2 1 0.07
Unidentified insect (0.007)
Naiad 0 0 0 0 0 0 0.2 0 0 0 0 0 0.007 1 0.07
Other Invertebrates (17.5)
Chilopoda 8.6 6.3 6.5 6.3 6.6 1.8 9.3 5.1 5.5 8.5 15.9 14.5 6.5 105 78.4
Diplopoda 7.3 11.3 12.2 3.7 2.0 1.1 1.3 1.5 3.7 3.2 5.0 7.0 3.8 84 62.7
Narceus sp. 0 0 0.3 0.8 1.8 4.6 8.8 1.0 0.9 0 0 0 1.8 23 17.2
Sowbug 3.3 3.5 6.7 2.5 2.9 2.2 0.2 0.8 0.7 0.5 0.7 1.5 2.2 51 38.1
Aranaea: Spider 2.8 2. 3.2 3.5 1.6 1.0 0.8 0.7 2.1 1.7 4.9 4.0 2.1 79 59.0
Earthworm 1.6 0.3 0.8 0.6 0.04 0.3 0 0 0.5 2.3 0 5.0 0.6 21 15.7
Crab 0 0 0 0 0 0.09 0 0.2 1.1 0 0 0 0.2 4 3.0
Snail 0.4 0.5 0.7 0.07 0 0.2 0.2 0 0 0.2 0.3 0 0.2 17 12.7
Mites/Ticks 0 0 0 0 0.04 0.04 0 0 0 0 0 0 0.01 2 1.5
Slug 0 0 0 0 0 0 0 0 0 0.2 0 0 0.007 1 0.07
Invertebrate – unidentified 0 0 0 0.07 0.1 0.4 0 0 0 0 0 0 0.09 5 3.7
502 Southeastern Naturalist Vol. 11, No. 3
Percent volume Frequency
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total Total Percent
Vertebrates (1.9)
Scaphiopus holbrookii 0 0 0 4.3 0 0 0 0 0 0 0 0 0.5 1 0.07
Frog – unidentified 2.3 0 0 0.4 0 0 0 0 0 0 0.3 1.0 0.3 6 4.5
Bufo terrestris 0.8 0 0 1.3 0.4 0 0 0 0 0 0 0 0.3 2 1.5
Lizard eggs 0 0 0 0.4 0.2 0.1 0 0 0.7 0 0 0 0.2 6 4.5
Anolis carolinensis 0 0 0 0 0 0.7 0 0 0 0 0 0 0.1 3 2.3
Scincella lateralis 0.8 0 0 0 0 0 0 0 0 0 0 0 0.07 2 1.5
Eumeces sp. 0.6 0 0 0 0 0 0 0 0 0 0 0 0.06 1 0.07
Unidentified lizard 0.3 2.0 0.3 0 0 0 0 0 0 0 0 0 0.1 5 3.7
Mammal 1.6 0 0 0 0 0 0 0 0 0 0 0 0.2 1 0.07
Bird 0 0.3 0 0 0.5 0 0 0 0 0 0 0 0.1 3 2.2
Plant material (11.8)
Diospyros virginiana fruit 0 0 0 0 0 0 0 34.3 22.6 20.2 0 0 6.0 19 14.2
Endogonaceae (clumps) 2.3 2.7 0 0.07 0.04 3.3 0.8 3.0 2.4 0.2 1.4 4.0 1.6 32 23.9
Fungi 6.3 0.8 0 0 0 0.5 0 1.1 1.5 3.2 0 0 1.1 13 9.7
Nuts 0 0 0 0 0 0 0 0 0 0 11.4 0 0.6 1 0.07
Fruit 2.8 0 0 0 0 0.2 0.8 0 0 4.2 0 0 0.5 7 5.2
Melia azedarach 0 0 0 0 0 0 2.2 4.0 0 0 0 0 0.4 5 3.7
Misc. veg.: leaves, roots, etc. 1.1 0.8 0 0.3 1.1 0.2 0 0 0.1 0.5 0.3 0 0.4 11 8.2
Acorn, Quercus sp. 2.9 0 0 0 0 0 0 0 0 0 1.1 0 0.3 2 1.5
Serenoa repens seeds 0 0 0 0 0 0.04 0 0 3.1 0 0.3 0 0.4 5 3.7
Unidentified plant material 0.2 0 0.8 0.5 0 1.1 0.2 0.3 0 0 0 1.0 0.03 8 6.0
Black Cherry fruit 0 0 0 0 0 1.1 0 0 0 0 0 0 0.2 1 0.07
Vitaceae,
Vitis/Ampelopsis sp. 0 0 0 0 0 0.2 0 1.3 0 0 0 0 0.1 3 2.2
Root clumps or dirt 0 0 0 0 0.3 0.1 0 0 0 0 0 0 0.08 2 1.5
Woven egg cases? 0 0 0 0 0 0.4 0 0 0 0 0 0 0.07 1 0.07
2012 J.O. Whitaker, Jr., C. Ruckdeschel, and L. Bakken 503
Appendix 2. Numbers of individuals of food items eaten by Nine-banded Armadillos on Cumberland Island, GA.
Total Percent of
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec numbers individuals
Coleoptera
Scarabaeidae – adult 19 11 3 248 1126 65 3 35 20 11 6 1547 3.6
Scarabaeidae – larvae 8 3 3 17 124 184 136 28 15 3 6 527 1.2
Carabidae 108 51 40 69 33 12 2 3 47 21 16 10 412 1.0
Calosoma scrutator – adults 1 42 12 5 2 62 0.15
Calosoma scrutator – larvae 322 9 9 340 0.8
Elateridae – adult 4 3 13 29 40 58 26 9 3 3 9 5 202 0.5
Elateridae – larvae 429 71 265 268 229 134 52 76 143 116 206 167 2156 5.1
Buprestidae 1 1 0.002
Cicindellidae 2 2 0.005
Cerambycidae 1 14 15 0.04
Hydrophilidae 1 1 0.002
Scaphididae 5 5 0.01
Cantheridae 1 1 0.002
Cantherid larvae 1 1 2 0.005
Staphylinidae 3 1 1 124 2 8 2 1 142 0.3
Tenebrionidae 5 1 17 24 84 22 4 157 0.4
Dytiscidae 1 1 0.002
Chrysomelid larvae 1 7 8 0.02
Curculionidae 4 1 1 2 1 9 0.02
Coleoptera – unidentified adults 21 101 159 535 48 19 62 2 62 3 1012 2.4
Coleoptera – unidentified larvae 10 28 187 221 7 3 2 5 1 464 1.1
Coleoptera pupae 6 5 11 0.03
Hemiptera
Thyreocoridae 1 2 5 3 11 0.03
Pentatomidae 1 1 2 0.005
Cynidae 2 2 4 0.009
Pyrochroidae 1 1 0.002
Coreidae 1 1 0.002
504 Southeastern Naturalist Vol. 11, No. 3
Total Percent of
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec numbers individuals
Anasa tristis 1 1 0.002
Lygaeidae 1 1 0.002
Aphidoidea – green 3 3 0.007
Membracidae 1 1 0.002
Nabidae 1 1 0.002
Unidentified Hemiptera 1 1 0.002
Homoptera
Cicada 2 1 3 0.007
Cicada – large nymphal 1 1 0.002
Cicadellidae 1 1 3 1 6 0.01
Hymenoptera
Formicidae 991 530 223 4474 5051 5756 1236 1105 1757 1578 335 141 23177 54.4
Bee 2 3 5 0.01
Vespidae 2 1 3 0.007
Orthoptera
Gryllidae – Gryllus sp. 4 1 3 11 15 3 42 52 13 8 5 157 0.4
Gryllidae – Nemobius sp. 6 1 7 0.02
Blattellidae 7 3 4 3 5 4 5 84 13 3 131 0.3
Tettigoniidae 2 2 1 1 1 7 0.02
Acrididae 1 1 8 10 0.02
Rhaphidophoridae 10 10 0.02
Gryllotalpidae 2 2 0.005
Orthoptera – unidentified 3 2 4 9 0.02
Lepidoptera
Lepidoptera – larvae 236 66 222 81 586 767 186 41 82 44 192 36 2539 6.0
Lepidoptera – pupae 3 1 1 52 32 12 2 5 3 2 113 0.3
Lepidoptera – adult 1 337 338 0.8
Isoptera
Isoptera – adult 103 232 1191 1221 165 60 40 1 7 15 3035 7.1
2012 J.O. Whitaker, Jr., C. Ruckdeschel, and L. Bakken 505
Total Percent of
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec numbers individuals
Diptera
Chironomidae 200 200 0.5
Chironomidae – larvae 3 1 5 100 109 0.3
Tipulidae – larvae 2 16 21 4 1 3 2 49 0.1
Stratiomyidae – larvae 3 3 0.007
Unid. Diptera – adult 2 2 4 0.009
Unid. Diptera – larvae 157 150 1 1 11 1 1 322 0.8
Dermaptera
Dermaptera – adult 3 1 4 0.009
Odonata
Anisoptera – dragonfly 1 1 0.002
Unidentified Insect
Naiad 1 1 0.002
Other invertebrates
Chilopoda 170 46 127 106 91 53 53 106 78 29 101 59 1019 2.4
Diplopoda 464 158 192 210 69 31 4 10 25 19 46 24 1252 2.9
Narceus 1 3 8 16 9 3 4 44 0.1
Sowbug 176 36 344 595 470 198 1 16 20 10 7 8 1881 4.4
Aranaea: spider 30 15 26 20 40 26 9 11 13 13 16 7 226 0.5
Earthworm 107 6 13 13 1 11 27 27 15 220 0.5
Crab 2 1 9 12 0.03
Snail 3 3 6 4 4 2 1 2 25 0.06
Mites/ticks 2 1 3 0.007
Slug 1 1 0.002
Invertebrate – unidentified 1 6 1 1 9 0.02
Vertebrates
Scaphiopus holbrookii . 1 1 0.002
Frog – unidentified 2 2 2 6 0.01
Bufo terrestris 1 1 2 0.005
506 Southeastern Naturalist Vol. 11, No. 3
Total Percent of
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec numbers individuals
Lizard eggs 3 11 1 5 20 0.05
Anolis carolinensis 1 1 2 0.005
Scincella lateralis 2 2 0.005
Eumeces sp. 1 1 0.002
Unidentified lizard 5 5 0.01
Bird 1 2 3 0.007
Plant material
Diospyros virginiana 1 75 76 0.2
Endogonaceae (clumps) 1 21 1 82 15 6 7 133 0.3
Fungi 1 1 2 4 0.009
Nuts 39 39 0.09
Fruit 5 7 12 0.03
China berry,
Melia azedarach 8 46 54 0.1
Misc. veg.: leaves, roots, etc. 1 1 2 1 1 6 0.01
Acorn, Quercus sp. 1 1 2 0.005
Serenoa repens seeds 40 10 50 0.1
Unidentified plant material 2 6 1 9 0.02
Black cherry fruit 78 78 0.2
Vitaceae
Vitis/Ampelopsis sp. 54 54 0.1
Root clumps or dirt 3 1 4 0.009
Woven egg cases? 4 4 0.009
Seeds – blackberry, Rubus sp. 1 1 0.002
Total 3093 1279 3144 8189 9041 7598 1909 1876 2563 2019 1395 504 42,610 100