Some moths are built to essentially cancel sound - and it's a pretty effective defense mechanism against bats and echolocation. Plus: a heart-shaped work of art made by bees!
Egyptian fruit bats are known to make a lot of noise while they’re roosting. Scientists at Tel Aviv University have determined that a lot of that noise is bats getting annoyed at other bats. Plus: scientists studying endangered bats in Cuba tag them in a very fancy way, with little bat-manicures!
You expect this kind of thing in Gotham City, but not here.