Primates

Until recently, only humans were in the family Hominidae, other great apes were put in the family Pongidae. Now humans share this family along with Chimpanzees, Gorillas, and Orangutans. Over the last two decades, evidence linking humans to Chimpanzees and Gorillas have grown, especially with the increase of molecular techniques. Hominidae are the largest of the primates, they have robust bodies and well-developed forearms. Both their thumb and big toe are opposable, except in humans who have lost opposability in their big toe. All their digits have flattened nails, and no hominid has a tail. Skeletal differences between hominids and other primates are due to their upright or semi-upright stance.

Bonobo (or Pygmy) Chimpanzee
Common Chimpanzee
Gorilla
Orangutan
Pygmy (or Bonobo) Chimpanzee