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Adirondack Park Aldo Leopold Allen American animals Arctic areas Arthur Morris/Birds bill Biological Survey biologists bird protection bison breeding California California condor Carson century coast condor Congress conservation conservationists Cox/Natural Exposures coyotes decade deer ducks Dutcher eagles ecosystem eggs egrets Endangered Species environmental Everglades extinction feathers federal Fish and Wildlife Florida funding Gilbert Pearson habitat hawk herons Hornaday hunting industry Island ivory-billed ivory-billed woodpecker John killed Lake land later logging Mangelsen Migratory Bird Morris/Birds As Art Mountain National Audubon Society National Forest National Wildlife Refuge natural nesting North numbers old-growth ornithologist passenger pigeon pelicans pesticides Photo courtesy pigeons plume pollution population prairie dogs predators president River Roger Tory Peterson Roosevelt scientists shooting Silent Spring South spotted owl terns tion trees U.S. Fish U.S. Forest Service varmint warden waterfowl wetlands whoopers whooping cranes wild Wilderness Society Wildlife Service wolves woodpecker wrote Yellowstone York