Welcome to HabiChat, a podcast miniseries exploring ecosystems and the animals which live in them. Join *Cosmos *journalists as they talk to experts about the who’s who, and where’s where, of mammals in Australia. Cosmos journalists Jacinta Bowler and Matthew Ward Agius talk to Natasha Harrison, a conservation biologist and behavioural ecologist in her final PhD year. They join her in a woodland) soundscape and talk about the furry little t-rex of the mammal world – the brush-tailed bettong) – and the threats facing them.