Koala

Phascolarctos cinereus, the koala (Phascolarctidae), is the only living species of its family and one of Australia's most recognisable marsupials. Adults measure 60–90 cm and weigh 4–15 kg, males about 50% heavier than females; the brain averages only about 19 g. It is restricted to eucalypt woodlands of eastern Australia, an area of roughly one million square kilometres, and feeds almost entirely on the leaves of some 30 eucalypt species, taking about 400 g a day and sleeping up to 20 hours. IUCN assessed it as Vulnerable in 2020, with a decline of about 30% over 18–24 years.