The South American rainforest katydid is not a human. In fact, it is so very unlike a human, it seems ridiculous to belabor the point with specifics. Six legs, wings, an exoskeleton. You get the picture. Its ears are on its hind legs, for crying out loud.
The world's smallest ear doesn't belong to any animal. Instead, it's a tiny piece of gold suspended in a laser beam. It can hear sounds a million times fainter than any human ear can, making it a powerful acoustic microscope.
Bats rely on their hearing more than any other mammal. After all, bats navigate the night sky by hearing the results of their echolocation, their natural sonar system. Turns out that's just the beginning of what makes bat-hearing amazing.