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Mammals of Delaware

The mammals most often spotted in Delaware, ranked by recent research-grade observations.

9,816
recent observations
46
species listed
46
mammals

Naturalists have logged 9,816 research-grade observations across the 46 most-recorded species in Delaware. The most frequently seen is the White-tailed Deer, with 1,926 recorded sightings.

Most-observed mammals in Delaware

White-tailed Deer
Odocoileus virginianus
1,926 observations
Red Fox
Vulpes vulpes
1,543 observations
Eastern Gray Squirrel
Sciurus carolinensis
1,385 observations
Eastern Cottontail
Sylvilagus floridanus
1,284 observations
Common Raccoon
Procyon lotor
576 observations
Groundhog
Marmota monax
445 observations
American Beaver
Castor canadensis
401 observations
Muskrat
Ondatra zibethicus
278 observations
Tamanend's Bottlenose Dolphin
Tursiops erebennus
264 observations
Eastern Chipmunk
Tamias striatus
247 observations
Northern Short-tailed Shrew
Blarina brevicauda
220 observations
Virginia Opossum
Didelphis virginiana
176 observations
Grey Seal
Halichoerus grypus
142 observations
Harbor Seal
Phoca vitulina
129 observations
Striped Skunk
Mephitis mephitis
87 observations
North American River Otter
Lontra canadensis
81 observations
White-footed Mouse
Peromyscus leucopus
81 observations
Coyote
Canis latrans
71 observations
Domestic Cat
Felis catus
71 observations
Eastern Red Bat
Lasiurus borealis
45 observations
American Red Squirrel
Tamiasciurus hudsonicus
45 observations
American Mink
Neogale vison
41 observations
Eastern Mole
Scalopus aquaticus
34 observations
Southern Flying Squirrel
Glaucomys volans
32 observations
Brown Rat
Rattus norvegicus
30 observations
Big Brown Bat
Eptesicus fuscus
27 observations
House Mouse
Mus musculus
25 observations
Gray Fox
Urocyon cinereoargenteus
21 observations
Eastern Meadow Vole
Microtus pennsylvanicus
18 observations
Masked Shrew
Sorex cinereus
13 observations
Humpback Whale
Megaptera novaeangliae
12 observations
North American Least Shrew
Cryptotis parvus
12 observations · iNaturalist
Silver-haired Bat
Lasionycteris noctivagans
10 observations
Sika Deer
Cervus nippon
8 observations
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
5 observations · iNaturalist
American Black Bear
Ursus americanus
3 observations
Eastern Fox Squirrel
Sciurus niger
3 observations
Harp Seal
Pagophilus groenlandicus
2 observations
Common Dolphin
Delphinus delphis
1 observation
Fin Whale
Balaenoptera physalus
1 observation
Domestic Cattle
Bos taurus
1 observation
Tri-coloured Bat
Perimyotis subflavus
1 observation
Long-tailed Weasel
Neogale frenata
1 observation · iNaturalist

Built from recent research-grade iNaturalist observations. Identifications are community-sourced and may occasionally be wrong, and the ranking reflects where people record and photograph wildlife, so a species seen often here is not necessarily rare elsewhere. Some plants and animals are only out in certain seasons. Treat this as a lively snapshot of what people are finding, not a formal checklist.

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