One of the best-known and longest-lived early human species is Australopithecus afarensis. This species existed between 3.85 and 2.95 million years ago in eastern Africa; specifically Ethiopia, Kenya, and Tanzania. The species survived for nearly 900,000 years by adapting to the changing environment. Paleoanthropologists first discovered Australopithecus afarensis in 1974 and since then, have found over 300 individuals and associated traces of this species including the well-known "Lucy" fossil and the footprints at Laetoli. Australopithecus afarensis had features resembling both apes and humans: they had ape-like faces and small brain cases, but regularly stood on two legs and walked bipedally. They were small (roughly 1/3 the size of modern humans), with the males averaging 4ft 11in and the females averaging 3ft 5in in height. Unlike later species, they lived in both trees and on the ground and had mainly a plant-based diet supplemented with the occasional small vertebrates, such as lizards.