JOHANNESBURG, SOUTH AFRICA—Paleoanthropologist Lee Berger of Wits University and his colleagues suggest that Homo naledi intentionally buried their dead, according to a Science News report. Homo naledi, whose remains were discovered in South Africa’s Rising Star Cave System, lived in southern Africa between about 335,000 and 236,000 years ago. Among the remains recovered from the cave system are bones thought to have belonged to an adult H. naledi found in a shallow pit in the cave system’s Dinaledi Chamber. Berger thinks these bones may have become detached as the cave’s dry sediments collapsed, or perhaps as other burials were dug in the chamber, since bone fragments from at least one other individual have been found in the pit. Bones found in another shallow pit in this chamber have not yet been analyzed. CT scans of three blocks of sediment removed from an adjacent space known as the Hill Antechamber showed that they also contain H. naledi remains. One set, found curled in a fetal position, may have also been buried in a shallow depression. Scattered teeth detected in this block of sediments are thought to have been introduced during the burials of other individuals, the researchers explained. A crescent-shaped stone may have been used by H. naledi as an implement to chisel lines and designs on the walls of a corridor and entry into this chamber, Berger added, although the engravings have not been dated. Critics, however, note that the remains may have accumulated in cave shafts and then fell into the chambers, or may have been left at the back of chambers. In this scenario, trampling by other individuals could have produced the fragments, while water seepage into the cave system could have carried H. naledi remains along the sloping cave floors until the bones came to rest in natural depressions in the sediments. For more, go to "Cradle of the Graves."