Udel is the name of a male Orang Utan from Kalimantan (Borneo Island). The Orang utan includes two subspecies, the Sumatran orangutan (Pongo abelii) and the orangutan of Kalimantan / Borneo (Pongo pygmaeus). Borneo Orangutan (Pongo pygmaeus) is a large primate species found inhabiting forests in the humid tropical Borneo. Also known as Red Ape, Borneo orangutan species of ape is the second largest in the world (after Gorilla) and is the largest animal that lived in the trees on the planet.