One day I saw something, it looked upside down hanging from tree branch. I went home and asked my dad. He said it was a ‘bat’. I said bat, what is a bat? A bat is a mammal, which flies at night. Bats rest during the day and stay awake at night. Is this really true dad, asked Ritesh? Dad replied, yes son. Bats are only mammals that can fly. All bats can see. bats hunt for food in the night. There are almost 1000 species of bats. they are found in caves, trees and buildings. they eat insects, small mammals, birds and fish.