DNA fingerprinting provides evidence of discriminate suckling and non-random mating in little brown bats Myotis lucifugus.

Recent advances in DNA extraction and fingerprinting techniques allowed examination of genetic similarity of groups of Myotis lucifugus at maternity roosts. Mean percentage band-sharing between young was significantly higher than between mothers, suggesting fertilization success skewed for individual males or male lineages. Mean percentage band-sharing between presumed mothers and young was significantly higher than band-sharing between all other groups, suggesting that Myotis lucifugus preferentially suckle their own young.