The Associated Press ONALASKA, Wis. — It’s best to let sleeping bats lie in winter. When bats prematurely wake from their hibernation and leave their haunts — as some did after polar vortex ...

But why do bats sleep upside down? This topsy-turvy behavior ... The ancestors of modern bats might have climbed tall trees and dropped to glide between the trunks, likely evolving strong limbs ...