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.

By what criteria are chimpanzees, orangutans, and gorillas

The orangutan who speaks like a human

Monkeys vs Apes: How are they different? - PASA

Primate test - Apenheul

Gibbon - Wikipedia

The Leakey Foundation Five Fun Facts About Gibbons

Orangutans - Orangutan SSP

Ape vs Monkey - Difference and Comparison

All 4 Types of Non-Human Ape - A Detailed Comparison