Gilbert's potoroo or ngilkat is Australia's most endangered marsupial, the rarest marsupial in the world, and one of the world's rarest critically endangered mammals, found in south-western Western Australia. It is a small nocturnal macropod that lives in small groups.

Two Peoples Bay Nature Reserve is a protected area managed by the Department of Parks and Wildlife 35 kilometres (22 mi) east of Albany, Western Australia. The area is accessible by 2WD vehicles. The bay itself, including two small secluded beaches, faces due east and is protected from the Southern Ocean by a headland formed by the granite massif of Mount Gardner. The nature reserve was established in 1967 to protect the threatened noisy scrub-bird and its habitat. It is known for being the site of the discovery and naming of Gilbert's potoroo, but in 2015 a huge fire destroyed 90% of the tiny marsupial's habitat, as well as killing three-quarters of the remaining small population.