WTD created an anthropoid 3D animation comparing the size of different primates and their extinct ancestors.
Multimedia Gallery - Comparison of brain sizes of a variety of primates
Human evolution - Wikipedia
Monkeys vs Apes: How are they different? - PASA
About Apes - Center for Great Apes
What the Hell is a Bonobo?
A Size Comparison of Various Primates
Person of the Forest, Researchers Go to Borneo to Learn About the Human-Primate Connection
Chimpanzees vs. Bonobos: What's the Difference? •
The Largest Ape That Ever Lived Was Doomed By Its Size
Is a Chimp a Monkey? - Jane Goodall : Jane Goodall