Watch bats prepare for their nightly flight. More on this story https://www.insidescience.org/content/inside-bat-house/3351. For more from Inside Science visit us at www.insidescience.org. The Bat House and UF Bat Barn located on the campus of the University of Florida in Gainesville have become home for an estimated 300,000 bats. In these houses, every evening is like Halloween. As the sun sets the crowds gather to see the current residents because they don't come out during the day. "I'm here to see a big cloud of bats," said Kristine Bickery, an observer. The excitement is building… "I heard hawks come down too to try and eat the bats," said Clarisse Rebancos, another on-looker of the nightly event. The cameras are aimed and ready…and all for the nightly exodus of 300-thousand bats. "This is home of the world's largest occupied bat house and bat barn," said Paul Ramey, assistant director of marketing and publicity at the Florida Museum of Natural History at the University