 The high diversity and endemicity of mammals is related to the many niches found in the tropical rain forest of Borneo and past Pleistocene events within the Sundaland region.During interglacial and post-glacial periods, there was migration of animal from the Asian mainland into Borneo and into Sulawesi via the Philippines.Due to lack of favourable habitats and small founder population, some species of animals have become extinct and others have radiated into endemic species.