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List of Illustrations I A bird defined
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activity adapted adult Africa albatrosses altricial American robin animals Archaeopteryx Arctic behavior bill bird of paradise bird song bird's body breeding colony color continent cormorants correlated courtship cuckoo developed display dive ducks egg tooth eggs evolution evolved factors falcon Family fauna feathers feeding feet female fish flight flightless flock flycatcher flying forest fossil Genus glands grackles grebes ground groups gulls habitat hatching hawks herons hummingbirds incubation individual insects islands legs living male mammals mating migration miles molt muscles naturalist nest building nightjars North northern ornithologist pair parent parrots passerine patterns pelicans penguins perching pigeon plumage population predation prey quail quills reptiles sandpiper season shorebirds skin small birds social parasitism song songbirds South America sparrow species storks structure subspecies swallows swifts swimming tail terns territory thrush tion tree tropical vultures warblers weaverbirds wings winter woodpeckers young birds