Odorants differentiate Australian Rattus with increased complexity in sympatry

Odorant cues play a critical role in premating isolation among many species. In mammals, they have been most well-studied in rodents, but only in a handful of species. The genus Rattus is one of the most species-rich genera of mammals, with a natural distribution from Asia to Australia and a nearly global distribution for a few species that spread through human commensalism. More than one-third of Rattus species are the result of a recent and...