Types of Apes, Gibbons, Gorillas, Orangutans, Chimp

There are two main types of apes: "lesser apes" and "great apes". Lesser apes include mainly all gibbon species, whereas the Great apes include orangutans, gorillas, chimpanzees, and bonobos.

Orangutan - Wikipedia

Asian Apes At-A-Glance New England Primate Conservancy

Phylogenetic tree of the living apes. The four lesser ape genera

Buy Apes (9780954307028): Gorillas, Chimpanzees, Orangutans and Gibbons: NHBS - Ray Hutchins, Merlin Publications

Apes

The orangutan who speaks like a human

Ape vs Monkey - Difference and Comparison

Apes vs Monkeys: Key Differences Between Apes and Monkeys

Primates: Monkey & Apes

The Primates: Apes