New research finds fresh evidence that urbanization in the United States threatens the populations of some species of migratory birds. But the six-year study also refutes one of the most widely accepted explanations of why urban areas are so hostile to some kinds of birds. According to the researchers, most ecologists have assumed that common nest predators in urban areas – such as house cats and raccoons – were destroying eggs or killing young birds in greater numbers than in rural areas. (source: sciencedaily.com)
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