Animals found here include the huge saltwater crocodile and a rich variety of birds such as the channel-billed cuckoo, Pacific koel, purple-crowned fairywren and the bowerbird. The sandstone gorges of north Kimberley are an important refuge for a particularly rich collection of endemic species including some that have disappeared from the flatter areas, including the purple-crowned fairywren, the endangered Gouldian finch and a large number of amphibians: flat-headed frog, cave-dwelling frog, magnificent tree frog, Derby toadlet, small toadlet, fat toadlet, the unconfirmed marbled toadlet, Mjoberg's toadlet, mole toadlet and stonemason's toadlet. Mammals that have declined especially in the flatlands include the bilby, northern quoll, pale field rat, golden-backed tree-rat, and golden bandicoot. Megabats such as the black flying foxes and little red flying foxes are common and perform important pollination and seed dispersal work for many species of native trees and shrubs.