According to the Defenders of Wildlife, some bats eat mammals such as mice. About 70 percent of bats are insectivores and function as pest controllers. BatsLive indicates that most of the rest of bats consume fruit and nectar, while a very small number feed on small vertebrates or blood.
Defenders states that there are about 1,000 bat species worldwide, and they vary significantly in other characteristics besides diet. While the wingspan of some bats is 6 feet, there are tiny bats barely an inch long. Bats are found all over the planet except in polar areas and the hottest deserts. When winter comes, certain bats migrate, while others hibernate. In addition, some bats take winter breaks by lowering their body temperatures for days, weeks or months.