As Birds Migrate North, NYC Is Their Biggest Obstacle

Flocks of birds are traveling north for spring migration, putting them in danger of colliding with New York City's countless glass buildings and windows.

Between 90,000 and 230,000 birds die while flying through the five boroughs every year, according to New York City Audubon, which is a loss that is very serious for endangered species.

Some of the biggest threats come from windows that reflect natural habitats, or reveal indoor houseplants. 

"Birds see that reflection and fly to it," said Kaitlyn Parkins, a conservation biologist with New York City Audubon. 

Building developers and architects have many ways for making a building more bird-friendly, said Parkins, including making glass less reflective. Individuals can also help guide birds more safely through New York City this season by putting stickers on their windows, or painting glass with tempera paint designs. 

New York City Audubon has been researching bird fatalities during migration season since 2014, with Project Safe Flight.