Mammals of Delaware
The mammals most often spotted in Delaware, ranked by recent research-grade observations.
Most-observed mammals in Delaware
White-tailed Deer
Odocoileus virginianus
1,734 observations
Red Fox
Vulpes vulpes
1,427 observations
Eastern Gray Squirrel
Sciurus carolinensis
1,279 observations
Eastern Cottontail
Sylvilagus floridanus
1,144 observations
Common Raccoon
Procyon lotor
534 observations
Groundhog
Marmota monax
409 observations
American Beaver
Castor canadensis
350 observations
Muskrat
Ondatra zibethicus
266 observations
Eastern Chipmunk
Tamias striatus
232 observations
Tamanend's Bottlenose Dolphin
Tursiops erebennus
218 observations · iNaturalist
Northern Short-tailed Shrew
Blarina brevicauda
195 observations
Virginia Opossum
Didelphis virginiana
162 observations
Grey Seal
Halichoerus grypus
138 observations
Harbor Seal
Phoca vitulina
120 observations
Striped Skunk
Mephitis mephitis
81 observations
North American River Otter
Lontra canadensis
74 observations
Coyote
Canis latrans
70 observations
Domestic Cat
Felis catus
65 observations
White-footed Mouse
Peromyscus leucopus
58 observations
Eastern Red Bat
Lasiurus borealis
43 observations
American Mink
Neogale vison
40 observations
American Red Squirrel
Tamiasciurus hudsonicus
39 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
24 observations
House Mouse
Mus musculus
23 observations
Gray Fox
Urocyon cinereoargenteus
20 observations
Eastern Meadow Vole
Microtus pennsylvanicus
17 observations
Silver-haired Bat
Lasionycteris noctivagans
10 observations
Humpback Whale
Megaptera novaeangliae
10 observations
Masked Shrew
Sorex cinereus
9 observations
Sika Deer
Cervus nippon
8 observations · iNaturalist
North American Least Shrew
Cryptotis parvus
8 observations · iNaturalist
Star-nosed Mole
Condylura cristata
6 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
5 observations
Woodland Vole
Microtus pinetorum
4 observations
American Black Bear
Ursus americanus
3 observations
Domestic Dog
Canis familiaris
3 observations · iNaturalist
Harp Seal
Pagophilus groenlandicus
2 observations · iNaturalist
Common Dolphin
Delphinus delphis
1 observation
Fin Whale
Balaenoptera physalus
1 observation
Eastern Fox Squirrel
Sciurus niger
1 observation
Domestic Cattle
Bos taurus
1 observation · iNaturalist
Tri-coloured Bat
Perimyotis subflavus
1 observation
Long-tailed Weasel
Neogale frenata
1 observation · iNaturalist