Last Thursday night, members of the Natural History Society of Maryland gathered to watch a pretty amazing spectacle.
Thousands of chimney swifts, a type of migratory bird on its way to winter in South America, gathered to roost in a building across the street from the group's headquarters at 6908 Belair Road in Overlea.
The quality of the video isn't great, but each moving dot in the background is a bird headed down the chimney to roost for the night. Check out the video, originally posted to the group's Facebook page, posted above.
Have you ever seen a large flock of birds like this in the area? Tell us in the comments.