sentences: "Australopithecus", dated to have lived 2 to 3 million years ago, is the earliest hominid genus to demonstrate post-canine enlargement, with average post-canine tooth area ranging from approximately 460mm2 and going all the way up to the largest tooth area, 756mm2, which is seen in "Paranthropus boisei" .After "Australopithecus", a trend of steady decline in post-canine size is observed, starting in the genus "Homo" and culminating with "Homo sapiens" which has an average post-canine tooth area of only 334mm2.