![]() “The ovenbird and the black-throated blue warbler are among the hundreds of bird species that are now at an increased risk of extinction in North America because of climate change,” said Keith Russell with Audubon Mid-Atlantic. every year and those crashes are taking a toll on some species.Ĭommon yellowthroats, white-throated sparrows, gray catbirds and ovenbirds are the most common victims in Philadelphia, experts said, and those species are also threatened by climate change and other predators. Scientists estimate between 365 million and one billion birds are killed by collisions with buildings or other outdoor structures in the U.S. Windows pose a problem, according to Weckstein, because birds might see a reflection of trees or the sky. “That in combination with Philly’s bright city lights was a disaster for many fall migrant birds winging their way south.”īirds navigate during migration using celestial cues and when they cannot see stars on a cloudy night they get confused by bright city lights, according to experts. “Conditions were perfect for a heavy migratory flight and imperfect given that there was a low ceiling of clouds and rain,” Weckstein said. Hundreds of dead birds were found around the city. The coalition, which includes Audubon Mid-Atlantic, the Academy of Natural Sciences of Drexel University, the Delaware Valley Ornithological Club and two local Audubon chapters, formed after the city’s largest mass-collision event in 70 years was reported last October.
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