Mammals of Delaware
The mammals most often spotted in Delaware, ranked by recent research-grade observations.
9,254
recent observations
46
species listed
46
mammals
Naturalists have logged 9,254 research-grade observations across the 46 most-recorded species in Delaware. The most frequently seen is the White-tailed Deer, with 1,808 recorded sightings.
Most-observed mammals in Delaware
White-tailed Deer
Odocoileus virginianus
1,808 observations
Red Fox
Vulpes vulpes
1,472 observations
Eastern Gray Squirrel
Sciurus carolinensis
1,309 observations
Eastern Cottontail
Sylvilagus floridanus
1,215 observations
Common Raccoon
Procyon lotor
542 observations
Groundhog
Marmota monax
424 observations
American Beaver
Castor canadensis
357 observations
Muskrat
Ondatra zibethicus
270 observations
Tamanend's Bottlenose Dolphin
Tursiops erebennus
240 observations · iNaturalist
Eastern Chipmunk
Tamias striatus
235 observations
Northern Short-tailed Shrew
Blarina brevicauda
198 observations
Virginia Opossum
Didelphis virginiana
168 observations
Grey Seal
Halichoerus grypus
139 observations
Harbor Seal
Phoca vitulina
126 observations
Striped Skunk
Mephitis mephitis
87 observations
North American River Otter
Lontra canadensis
76 observations
Coyote
Canis latrans
71 observations
Domestic Cat
Felis catus
68 observations
White-footed Mouse
Peromyscus leucopus
65 observations
Eastern Red Bat
Lasiurus borealis
43 observations
American Red Squirrel
Tamiasciurus hudsonicus
40 observations
American Mink
Neogale vison
40 observations
Eastern Mole
Scalopus aquaticus
34 observations
Southern Flying Squirrel
Glaucomys volans
31 observations
Brown Rat
Rattus norvegicus
28 observations
Big Brown Bat
Eptesicus fuscus
26 observations
House Mouse
Mus musculus
24 observations
Gray Fox
Urocyon cinereoargenteus
20 observations
Eastern Meadow Vole
Microtus pennsylvanicus
17 observations
Humpback Whale
Megaptera novaeangliae
11 observations
Silver-haired Bat
Lasionycteris noctivagans
10 observations
North American Least Shrew
Cryptotis parvus
9 observations · iNaturalist
Masked Shrew
Sorex cinereus
9 observations
Sika Deer
Cervus nippon
8 observations · iNaturalist
Woodland Vole
Microtus pinetorum
7 observations
Star-nosed Mole
Condylura cristata
6 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
5 observations
Domestic Dog
Canis familiaris
4 observations · iNaturalist
American Black Bear
Ursus americanus
3 observations
Harp Seal
Pagophilus groenlandicus
2 observations · iNaturalist
Eastern Fox Squirrel
Sciurus niger
2 observations
Common Dolphin
Delphinus delphis
1 observation
Fin Whale
Balaenoptera physalus
1 observation
Domestic Cattle
Bos taurus
1 observation · iNaturalist
Tri-coloured Bat
Perimyotis subflavus
1 observation
Long-tailed Weasel
Neogale frenata
1 observation · iNaturalist
Mammals in nearby places
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