Some deep-sea jellyfish produce their own light when fleeing a predator, shining bright tentacles in the face of the blinded pursuer. Flying squirrels don't really fly. They have webbed skin that allows them to glide downward, but not up. Some desert flowers bloom at night to attract nocturnal creatures that can spread pollen from flower to flower. If worms didn't live in soil, the dirt would be as hard as concrete.
Dolphins send out sounds and listen for echoes, just like bats do.
Fish have special organs on their bodies that allow them to feel movements in the water made by other animals. Bats can eat their own weight in insects in one night.