It has become one of the strangest stories to come out of the New Year and one of the most puzzling for scientists and local officials: Just what caused 5,000 birds to fall from the sky just before midnight New Year's Eve in Beebe, Arkansas?
As news of the story spread across the globe, so did speculation about what caused the Hitchcockian scene. And as officials wait for the official necropsy (animal autopsy) report, we're taking a look at some of the theories that officials and scientists have suggested.
Karen Rowe, an ornithologist for the Arkansas Game and Fish Commission, said the incident is not that unusual and is often caused by a lightning strike or high-altitude hail. This theory could hold in this case, she said, especially because a strong storm system moved through the state earlier Friday.
Keith Stephens, a spokesman for the commission, told Reuters that storm weather, including hail or lightning, could be the culprit, but so far, he had yet to see any sign of injury on birds that were collected.
Rowe told Live Science that events like this have happened across the globe, and generally, weather is to blame. She said birds have been swept up and moved when caught up in hurricanes, wind can force them into a large object like a cliff, or large groups of birds can clash and crash in heavy fog, killing them.
On CNN's "American Morning," Stephens told Kiran Chetry and Jim Acosta that in addition to weather, local New Year's Eve celebrations may be to blame.
"We're leaning towards maybe a stress event," he said.
Stephens said revelers, "possibly shooting some fireworks while the birds were roosting," could have scared them, causing trauma.
"That could have been what caused their deaths," he said.
But birds don't fall out of the sky whenever there are fireworks, so what makes this event different? Stephens said that in rural areas, birds can be more concentrated. And if fireworks were set off near them in a roosting area while they were sleeping, such a trauma could have killed them.
Poisoning or disease
Rowe said it wasn't likely that poisoning or another illness could be to blame.
â€śSince it only involved a flock of blackbirds and only involved them falling out of the sky it is unlikely they were poisoned, but a necropsy is the only way to determine if the birds died from trauma or toxin,â€ť she said in a commission press release.
Officials have also said that because the situation was isolated, and because other groups of the birds in separate areas were not killed, they don't suspect the birds were poisoned.
For reasons similar to why they don't suspect poisoning, officials told Fox 16 in Arkansas that the bird deaths probably aren't related to any kind of disease.
Air tests by the Arkansas Department of Environmental Quality came back clean for any toxin, KTHV reports.