Six years later the London-born Kenyan paleoanthropologist Meave Leakey and archaeologist Alan Walker excavated the Allia Bay site and uncovered several additional fragments of the hominid , including one complete lower jaw bone which closely resembles that of a common chimpanzee ( Pan troglodytes ) but whose teeth are much more similar to those of a human . Six years later the London-born Kenyan paleoanthropologist Meave Leakey and archaeologist Alan Walker excavated the Allia Bay site and uncovered several additional fragments of the hominid , including one complete lower jaw bone which closely resembles that of a common chimpanzee ( Pan troglodytes ) but whose teeth bear a greater resemblance to those of a human .