Bats

Almost every night if it's clear enough these bats fly around the top of the building. The light attracts bugs and the bats feed on them. It's pretty cool to see since this building is actually pretty far away. That means these are fairly large bats. If you look really close above the blue lights you can see tiny blue dots. Those are the bats. I tried to take a video too, but it didn't really turn out well.