The ghost bat (Macroderma gigas), also known as the false vampire bat is a bat native to Australia. The bat is named for the extremely thin membrane of its wings that makes it appear ghostly at night. Ghost bats have grey fur on their backs and pale grey or white fur on their undersides. They have long, narrow wings, but no tail, averaging 11 centimetres (4.3 in) in length. Females are generally smaller than males. Ghost bats have large ears for long distance hearing, and very sharp teeth so they can attack prey.