True Toads, family Bufonidae, are a cosmopolitan group of amphibians commonly known for their distinctive dry, warty skin and parotoid glands behind their eyes, which secrete a milky toxin as a defense mechanism.

On the island of Borneo, True Toads inhabit a variety of environments, from lowland rainforests to mountainous regions.They currently comprise more than 30 species on Borneo (more will certainly be discovered). Most notable is the radiation of Stream Toads (Ansonia) species in Borneo's forest stream habitats. 

Many Bornean bufonids are lowland species, but some may ascend the highlands. In fact, Ansonia fuliginea, has the highest elevational distribution of all Bornean frogs, reaching >3.000 m asl on Gunung Kinabalu, Sabah.