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abundance adult animals aquatic areas beaver behavior bighorn biologists birds bison bobwhite breeding broods canadensis communities cover coyotes crops damage decline densities developed diet disease ecological ecosystems effect eggs energy environment epizootic example factors fawns feeding females fertilizers Fish and Wildlife forage forest growth habitat harvest herbivores herd human hunters hunting increased infected killed lakes land large numbers losses males mallards mammals migration migratory moose mortality mule deer natural nesting North America numbers nutrients occur parasites passenger pigeons percent pheasants Photo courtesy plants poisoning prairie predator control predators prey populations produced rabies range reduced remains reproductive ruffed grouse season sex ratio sheep shot snow snowshoe hares soil species spruce grouse survival tion trapping turkeys U.S. Fish ulation vegetation waterfowl wetlands whereas white-tailed deer whooping cranes wild wild turkeys wildlife management wildlife populations Wildlife Service winter wolves wood ducks