Green School, Bali

To the east, the Lombok Strait separates Bali from Lombok and marks the biogeographical division between the fauna of the Indomalayan ecozone and the distinctly different fauna of Australasia. The transition is known as the Wallace Line, named after Alfred Russel Wallace, who first proposed a transition zone between these two major biomes. When sea levels dropped during the Pleistocene ice age, Bali was connected to Java and Sumatra and to the mainland of Asia and shared the Asian fauna, but the deep water of the Lombok Strait continued to keep Lombok and the Lesser Sunda archipelago isolated.
Ecology
Bali lies just to the west of the Wallace Line, and thus has a fauna which is Asian in character, with very little Australasian influence, and has more in common with Java than with Lombok. An exception is the Yellow-crested Cockatoo, a member of a primarily Australasian family. There are around 280 species of birds, including the critically endangered Bali Starling, which is endemic. Others Include Barn Swallow, Black-naped Oriole, Black Racket-tailed Treepie, Crested Serpent-eagle, Crested Treeswift, Dollarbird, Java Sparrow, Lesser Adjutant, Long-tailed Shrike, Milky Stork, Pacific Swallow, Red-rumped Swallow, Sacred Kingfisher, Sea Eagle, Woodswallow, Savanna Nightjar, Stork-billed Kingfisher, Yellow-vented Bulbul, White Heron, Great Egret.