BATS Introduction Bats are mammals. They feed their young milk just like humans and other mammals. They are the only mammals that can fly. They do not have feathers but their wings are formed from their skin being stretch over their fingers.
Bats are nocturnal creatures, that means they only come out at night.
During the day bats roost in tree holes, caves and people's houses. In Britain there are fourteen species of bat. The most common bat in Britain is the pipistrelle. It is also one of the smallest bats at just 5 cm long , a wingspan of 20cm and a weight of 4 grammes. One of the largest British is the noctule.