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In addition to environmental aspects that cause range expansion and subsequent decline of certain species, humans have introduced species that are largely responsible for decline of native species. Exotic species , such as the European starling which were introduced by Eugene Schieffelin in 1890 in New York City and then expanded to California ...
The U.S. Fish and Wildlife Service strategy released Wednesday is meant to prop up declining spotted owl populations in Oregon, Washington state and California. Documents released by the agency ...
The California condor (Gymnogyps californianus) is a New World vulture and the largest North American land bird. It became extinct in the wild in 1987 when all remaining wild individuals were captured, but has since been reintroduced to northern Arizona and southern Utah (including the Grand Canyon area and Zion National Park), the coastal mountains of California, and northern Baja California ...
The California quail (Callipepla californica), also known as the California valley quail or Valley quail, is a small ground-dwelling bird in the New World quail family. These birds have a curving crest, plume or topknot made of six feathers, that droops forward: black in males and brown in females; the flanks are brown with white streaks.
Birds are a critical part of the ecosystem. If they can’t survive on the North American continent or in the world, other life forms may not make it either.
The birds already are being killed by researchers in some spotted owl habitats, with about 4,500 removed since 2009, said Robin Bown, barred owl strategy leader for the Fish and Wildlife Service.
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Birds are also threatened by high rise buildings, communications towers, and other human-related activities and structures; estimates vary from about 3.5 to 975 million birds a year in the North America alone. [18] The largest source of human-related bird death is due to glass windows, which kill 100–900 million birds a year.