What is a main cause of reduction in bird populations?
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Disease is a major source of mortality for birds, and may be the underlying cause of death in many cases of predation. Most avian diseases are fairly specific, such as the conjunctivitis eye disease that hit House Finches hard in the eastern states. read more
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Birds have greatly reduced in number due to human activities whichlead to dwindling habitats for the birds. read more
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North American Birds Declining as Threats Mount
news.nationalgeographic.com
The Decline of Eastern Songbirds
web.stanford.edu
