Indonesia, with its vast islands, tropical weather and rainforests is one of the world's richest and most important countries in terms of biodiversity. In addition to the many resident birds, a considerable number of migratory species winter in the country to escape their northern breeding grounds. The avifauna of Indonesia include a total of 1,748 species, of which 457 are endemic, and 3 have been introduced by humans. 150 species are globally threatened.