In Borneo and the surrounding islands competition by introduced faunas has not proved a significant factor affecting the survival of endemic species. Without exception, any threat has, in the past century and more, been invariably and directly attributable to human agency. Man, for instance, is the only predator of the Sumatran rhinoceros, Orang-utan, Clouded leopard, Argus and Bulwer's pheasant, White-bellied Sea-eagle and Island Megapode, which are among the forms most severely threatened at the moment.