Bipedal tool-using primates form the Hominina subtribe, of which the earliest species, such as Sahelanthropus tchadensis, date to about 7 to 5 million years ago.

• 使用工具的二足灵长类形成了人亚族，其中最早的人亚族物种如乍得沙赫人大约出现在7百万前至5百万年前。