There are two main groups of bats: Smaller “microbats” navigate by using sonar, and larger “megabats” rely on vision. Mammalogists once though that both kinds of bats evolve from insectivorous...

There are two main groups of bats: Smaller “microbats” navigate by using sonar, and larger “megabats” rely on vision. Mammalogists once though that both kinds of bats evolve from insectivorous mammals. But similarities between the visual systems of megabats and primates have led some researchers to think that megabats may have evolve from primates, perhaps lemurs. What results would support the hypothesis that the two groups of bats have a common origin? Separate origins?