If you do, you're wrong.
Some people think there is such a thing as flying mice but they are really bats.
Bats are mammals, just like you and me. Mammals are animals which give birth to live babies and the babies get milk from their mothers. Bats are the only flying mammals in the world. Some bats are called megabats and the others are called microbats. Flying foxes are the biggest bats with wingspans that can be as large as six feet across.