This section is from the book "Bird Guide: Water Birds, Game Birds And Birds Of Prey East Of The Rockies", by Chester A. Reed. Also available from Amazon: The Bird Book.
486a. Corvus corax principalis. 25 inches. The habits of all the ravens and crows are identical and are too well known to need mention. They are all very destructive to young birds and eggs. The Raven can be known by its large size, its very large bill and lanceolate feathers on the throat. They are found in the mountains from Georgia and on the coast from Maine northwards.
487. Corvus cryptoleucua. 18 1/2 inches. This species has the bases of the feathers on the back of the neck white. Found in southwestern United States.
488. Corvus americanus. 19 inches. The common Crow of North America, replaced in Florida by the very similar Florida Crow (pascuus).
490. Corvus ossifragus. 16 inches. This small species is found on the Atlantic coast north to Massachusetts.

 
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