Australopithecus sediba.
Known from four remarkable partial skeletons, this was a Pleistocene hominid that may have been a transitional form between A. africanus, and either H. habilis or H. erectus. The specimens known are a 13 year old male, an adult female, an 18 month old infant and an unidentified adult. They represent one of the most phenomenal paleoanthropological discoveries to date.

The dentition and jaw form of A. sediba is very similar to known Homo species, though they share many characteristics with Australopithecus. The hands of A. sediba are also very fine and modern, which coupled with their long arms suggests that they were capable of tool-making and living on the ground, but were still able to exploit the safety of trees when they had to. The discovery of four individuals close together means that they probably lived in family groups, much the same as modern apes (including humans).

Also, the placing of the fossils in a deep cave implies that maybe one individual fell down, and the others died trying to help them.

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