They can die if woken up during hibernation. If you go inside a cave, you'll see a congregation. Bats skim lakes and ponds so they can quench their batly thirst. There are a bunch of rumors, but none of them are true. I don't think that bats would like it, and neither would you.
Many bats communicate with chattering and shrieks.
Big-eared bats can roll their ears and tuck them in like wings. This helps them to save their heat but maybe block their hearing. Antarctica is bad for bats because they'll surely freeze. In the United States there are forty-five species. Baby bats called pups are always born alive.