During spring, bats return from migration or awaken from hibernation and the females begin having baby bats called "pups".
Bat pups are tiny when born, but grow up fast. Some species are flying and hunting on their own within a month of birth.
Bats, like people, usually only have one baby at a time although on occasion they'll have twins.
Pups are born without hair -- they look tiny, scrawny and pink. They drink milk from their mothers like all mammals do. They are born with strong legs and claws because they have to hang on to mom when she's roosting and to the cave when she's not there. If the baby looses its grip and falls, it will die.