The long legs and that modern ankle are key elements on the human side of the ledger, says Darryl de Ruiter, a paleoanthropologist at Texas A&M University and part of the Malapa team.

德州农工大学（Texas A&MUniversity）的古人类学家、也是伯杰团队成员的达瑞尔·德·鲁伊特（Darryl deRuiter）认为，长腿和现代脚踝是将其归入人类的主要因素。