Often associated with frightening horror movies - filling a jet-black sky as an ominous sign of something bad to come just as the clock is striking midnight - bats may be unsettling creatures but do you actually know much about them? For instance, you probably didn't know that there are more than 1,000 species of bats worldwide, according to the Nature Conservancy. That makes up one fourth of all the mammals and of those species, 40 different kinds of bats exist in North America.