Experts say that day or night, the vast majority of collision deaths are caused by low- and medium-rise buildings. Scientists have long known that birds are attracted to light, so when they fly over a bright city at night, they are naturally drawn toward it, unaware they are in dangerous territory.Īny city with glass structures and bright lights at night is a culprit, but some are more dangerous to birds than others. Most birds migrating through the US do so at night, when the airspace is cool and calm – and often end up veering through cities because their glow stands out. “Then when daylight comes, and they want to get more food, they’ll fly into a tree that they think is a tree, and it’s really a reflected tree in some glass building … Then they’ll slam into the glass, and then they die.” “They wind up landing somewhere that’s unfamiliar, like a sidewalk somewhere,” said Susan Elbin, director of conservation and science at New York City Audubon, a leading bird advocacy organization. The famous skyline of Manhattan is another death trap for birds, especially those migrating.
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