Crashes occur regularly at NASCAR races, but this collision story is for the birds.

More than 300 migrating chimney swifts flew into closed windows at the NASCAR Hall of Fame in Charlotte and crashed to the ground late Tuesday night, according to the Charlotte Observer.

The Carolina Waterfowl Rescue told the newspaper it received a call around 11 p.m. from a person who witnessed the dying birds falling to the sidewalk outside the building. More than 100 birds were killed in the episode, according to the report.

A witness named Holl Belle, who works in the building, posted a video on Facebook in which she claimed the incident took place for more than an hour. Another person can be overheard in the video saying, “Don’t let them hit you. There’s something wrong with them. It’s a whole flock. That’s odd.”

Carolina Waterfowl Rescue set up a fundraising page seeking donation to treat an additional 100 birds that were “severely injured with broken wings, legs or other fractures.”

The report cited the Cornell Lab of Ornithology saying roughly one billion birds in the United States alone die each year after flying into windows.

“Some of these nighttime collisions are due to chance, but much more often the nocturnal migrants are lured to their deaths by the lights,” the lab said.