know your orang utan....

Orangutans are contained in the class Mammalia because they are warm-blooded, possess hair on their body, have a four-chambered heart, and females produce milk from their mammary glands to nourish their young.

The order Primates has defining characteristics that are present in Orangutans such as the presence of differentiated tibia & fibula in the shank and ulna & radius in the forearm, presence of a clavicle, and possess five digit feet.

The family Hominidae exhibit both an opposable thumb and big toe (except humans), elimination of a tail, a large braincase, and flattened nails at the ends of the phalanges.

Orangutans are separated into the genus Pongo because they share less characteristics with humans than do Gorillas and Chimpanzees.