Orrorin tugenesis
Pictures and discussion of fragmentary finds from the Tugen Hills of Kenya, dated to 6 million years ago. Preliminary analysis of the 2000 finds suggests a wholly or partially bipedal hominid also adapted to climbing trees.

Adrian Warren Photo Library
Image gallery of chimpanzees and gorillas.

Fossil Hominids
Summary of species, proposed taxonomy and timeline for fossil hominids.

Sahelanthropus tchadensis
Picture and discussion of the fossil cranium TM 266-01-060-1 (Toumaï) found in Chad in 2001. It is estimated to be between six and seven million years old. Until other early hominid fossils are found to provide context it cannot be known how this species relates to the human, chimp, or even gorilla lines.

Hominoidea
Lecture notes on the superfamily, composed of Hominidae, the human line, and Pongidae, the great apes. Comparison chart of the four living great ape species, table of cultural behavior in chimpanzees, references and links.

Superfamily Hominoidea
Defining characteristics of living species in the three primate families Hylobatidae (gibbons), Pongidae (orangutans, chimpanzees, bonobos, and gorillas), and Hominidae. (humans).