Most commonly observed introduced mammals documented using iNaturalist by US state
22 states reported Domestic Cat, Felis catus, as the most commonly observed introduced mammal
6 states reported Eastern Cottontail, Sylvilagus floridanus, as the most commonly observed introduced mammal
4 states reported Domestic Horse, Equus caballus, as the most commonly observed introduced mammal
4 states reported Fox Squirrel, Sciurus niger, as the most commonly observed introduced mammal
4 states reported Wild Boar, Sus scrofa, as the most commonly observed introduced mammal
3 states reported Mountain Goat, Oreamnos americanus, as the most commonly observed introduced mammal
3 states reported Nutria, Myocastor coypus, as the most commonly observed introduced mammal
2 states reported Brown Rat, Rattus norvegicus, as the most commonly observed introduced mammal
1 state reported Donkey, Equus asinus, as the most commonly observed introduced mammal
1 state reported European Rabbit, Oryctolagus cuniculus, as the most commonly observed introduced mammal
1 state reported Red Fox, Vulpes vulpes, as the most commonly observed introduced mammal
1 state reported Small Indian Mongoose, Urva auropunctata, as the most commonly observed introduced mammal
Top 10 most commonly observed mammals in the US (reported on iNaturalist)
White-tailed Deer, Odocoileus virginianusv - Native to the US (but may be considered introduced in some states)
Eastern Gray Squirrel, Sciurus carolinensis - Native to the US (but may be considered introduced in some states)
Fox Squirrel, Sciurus niger - Native to the US (but may be considered introduced in some states)
Mule Deer, Odocoileus hemionus - Native to the US (but may be considered introduced in some states)
Common Raccoon, Procyon lotor - Native to the US (but may be considered introduced in some states)
Eastern Cottontail, Sylvilagus floridanus - Native to the US (but may be considered introduced in some states)
Coyote, Canis latrans - Native to the US (but may be considered introduced in some states)
Eastern Chipmunk, Tamias striatus - Native to the US (but may be considered introduced in some states)
California Ground Squirrel, Otospermophilus beecheyi - Native to the US (but may be considered introduced in some states)
Virginia Opossum, Didelphis virginiana - Native to the US (but may be considered introduced in some states)
(last updated November 2023)