The distinctions between microbats and megabats are: Most microbats feed on insects. Some of the larger species hunt birds, lizards, frogs, smaller bats or even fish. The 3 species of microbats that feed on the blood of large mammals or birds (vampire bats) exist in the Americas south of the United States. Microbats are 4 to 16 cm long. Leaf-Nosed... Found on http://en.wikipedia.org/wiki/Microbat