Previous work has shown that females have lower recombination rates than males in two distinctly related marsupial species, an American didelphid and an Australian dasyurid. We report here that the tammar wallaby (Macropus eugenii), which belongs to a third major group, has higher female recombination rates in two linked pairs. The nature of the sex differences in recombination rates in this species is thus similar to the situation in eutherian mammals.