The only known fossil of the great apes is a four-million-year old gorilla tooth. Now there may be another in the form of the upper part of a thigh bone found in 1961 in western Uganda. Originally identified as coming from a modern human, Jeremy DeSilva, a student at the University of Michigan, told the conference it is likely to have come from an ancestor of modern chimps.
Life
First fossil chimp
10 November 2004
