Some claim there are sub-species or races of the American eastern, western, Florida, etc. Identification can only safely be accomplished by voice comparison. Noted crow researcher, Dr. Kevin McGowan, likes to say that if you want to tell the species of a crow, ask it if it is an American crow. Fish crows will deny it by saying, nasily uh-uh . Originally they were found along the southeastern coastline but their range has expanded dramatically into the states of Arkansas, Tennessee, Kentucky, Mississippi, Oklahoma, Illinois and Kansas.
Populations are on the increase.
This species is smaller than the American but larger than the fish crow. They are a beach-combing crow found along the coastal tidelands of   Alaska south to Washington and Oregon states. Their voice is said to be more resonant than the American. Their diet consists of more aquatic invertebrates than the other species. The Audubon Field Guide reports that this species preys heavily on unattended eggs and hatchlings in cormorant and gull colonies.