OMAHA, Neb. (AP) — More than 250 bats are set to be released this week outside the Joslyn Art Museum in Omaha.

The Nebraska Wildlife Rehab is planning to release the flying mammals on Tuesday night. Staff with the wildlife organization will have bats on view for the public to get a closer look before their release.

The group takes care of the bats taken during the winter months when they should be hibernating. Most of the bats are brought to them after being discovered roosting inside buildings. The group feeds the bats during the winter, when food is scarce, and releases them in the spring.

Museum officials encourage those attending the free, annual event to bring their own picnic to enjoy on the lawn.