Birds Disease Impacting Local Bird Populations. but Pennsylvania hosts only four: blue jay, American crow, fish crow, and common raven. ii. Like a smaller edition of the American Crow, but with a more nasal voice, and typically found near water, the Fish Crow is very common in parts of the southeast. (*)

Where it occurs, it’s fairly common, but it is probably often confused with the common crow.

Birds of Pennsylvania . It used to be easy to identify crows in Pittsburgh.

Feathers of the head and neck oval and blended; third quill longest; tail considerably rounded, a small space at the base of the lower mandible on each side bare; general colour black, with blue and purple reflections above, blue and greenish beneath. Carolina Chickadee Photo: Michele Black/Great Backyard Bird Count. v.p. Corvus ossifragus.
479. POWERED BY MERLIN. Its Pennsylvania distribution centers in the southeast and along the Susquehanna River, including the West Branch.

The range expansion of Fish Crows, which often raid nests, may affect some species of breeding birds, especially colonially nesting species. This brown winged Fish Crow was taken by a member of a hunting ... Robert Podlesnik shot this incredibly unusual crow in southwestern PA in 1997. Every crow was an American crow (Corvus brachyrhyncos).). Fish Crow calls can be confused with the begging calls of American Crows.
The report says the species most vulnerable due to climate and other factors in Pennsylvania include the brown thrasher, cerulean warbler, eastern towhee, eastern whippoor-will, fish crow…

Avibase - Bird Checklists of the World Pennsylvania.

It is based on a wide variety of sources that I collated over many years. Twenty corvid species can be seen in the US.

I always say that if you want to tell the species of crow, ask it if it is an American Crow. Crow Pellets from Winter Roosts in Lancaster, Pennsylvania Mary Annala 1, Eric A. Tillman2, Gregory Backus3, Kandy L. Keacher2, and Michael L. Avery2,* Abstract - Although crows cast pellets, there is little quantitative information on pel-lets from Corvus brachyrhynchos (American Crow), and none from C. ossifragus (Fish Crow).

But not any more.

There is actually a relatively small area on the planet where all three species now interact–New Jersey, southern New York, eastern Pennsylvania, and Connecticut, where the range of Fish Crow overlaps with its larger congeners.

Fish Crow. Blue jays and American crows are common, but until this century ravens and fish crows were quite rare in Pittsburgh. FISH-CROW, Corvus ossifragus, Aud.