In this video resource from Nature: "Cracking the Koala Code", the koala breeding season is examined. The video segment looks at an outsider, a "traveling male," that enters an established koala colony and the territory battle that ensues. The koalas' communication techniques are also explored – when males feel threatened, they emit deep, guttural calls. The resource introduces a scientific experiment being conducted that looks at the breeding occurring with transient males. Such breeding leads to genetic diversity, which is beneficial to the species.

This video is available in both English and Spanish audio, along with corresponding closed captions.