
This undated photo provided by the Cleveland Museum of Natural History in August 2019 shows a fossilized cranium of Australopithecus anamensis. The species is considered to be an ancestor of A. afarensis, represented by “Lucy” found in 1974. From 3.8 million years ago, the ancestral species is the oldest known member of Australopithecus, the grouping of creatures that preceded our own branch of the family tree, called Homo. (Dale Omori/Cleveland Museum of Natural History via AP)