The fifth edition features:

• Inclusion of new putative hominin species named since the 4th edition, including Orrorin tugenensis, Sahelanthropus tchadensis, & Kenyanthropus platyops.  (It's been a busy few years!)
• Updates on all sectors of primate evolution.
• Updated taxonomy of the Hominidae.
• A reorganized text to make the flow of ideas easier and more exciting for the student.
• More paleoecology.
• More illustrations.
• A substantially expanded glossary.
• A unified reference list (not divided by chapter), to make it easier for students to follow up on references.