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Classification and Nomenclature
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adapted adult altricial American Robin American Sparrow animals Barn Swallow behavior bird migration bird songs bird study bird world Black-capped Chickadee Blackbird Blue Grouse Bob-white bones breeding season cent Chickadee color Condor courtship Cowbird Cuckoo developed dominant Ducks ecological eggs example extinct Falcon feathers feeding female flight flock flying forest fossil glands groups Gull habitat habits hatching Hawk House Sparrow Hummingbird incubation indicate land living male mammals mated Meadowlark Mockingbird molt muscles musical nest North number of birds occur ornithologists parasites Passerine Passerine birds Penguins perhaps Pigeon plumage population Prairie predators probably range regions reported reptiles Ruffed Grouse seems singing sometimes Song Sparrow South America species Starling structure Swallow Table tail temperature territory Tetraonidae tion trees tropical usually variations varies vegetation vertebrates Warbler Western Meadowlark wild Wilson Bulletin wing winter Woodpecker World York young birds