Orangutans are great apes of the genus Pongo, comprising three extant species: Pongo pygmaeus (Bornean orangutan), Pongo abelii (Sumatran orangutan), and Pongo tapanuliensis (Tapanuli orangutan). Members of this genus are large, primarily arboreal primates native to Southeast Asian rainforests, characterized by pronounced sexual dimorphism, long forelimbs, and reddish-brown pelage. Genetically, orangutans are among humans’ closest living relatives within Hominidae, and they serve as key models for studying primate cognition, life history evolution, and social systems. Their slow reproductive rate and specialized ecological niche make Pongo species highly vulnerable to habitat loss and fragmentation.
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