Mass bird deaths in New York City caused by skyscraper collisions

Hundreds of migrating birds have died this week in New York City after crashing into glass skyscrapers, according to local organisation NYC Audubon.
On Tuesday morning, 14 September, a volunteer at the NYC Audubon found over 200 dead birds dotted on pavements around the 3 World Trade Center and 4 World Trade Center skyscrapers alone.
By the end of her shift at the World Trade Center site, volunteer Melissa Breyer said she found 226 carcasses, though many more were "inaccessible, or too mangled t