The extensive analysis of a near-complete skeleton provides a detailed view into Archie’s varied traits. Its monkey-like feet and heels — for which the new species is named — and its tarsier-like hip and knee indicate that it leaped through the forest and crept along branches.
Its pointy teeth were, like those of tarsiers,used for chomping on insects. The skeleton suggests complex locomotion.
Archie’s relatively small eyes support Ni’s theory that the yet-to-be-discovered ancestor of our branch of primates was, like humans, active during the day, or diurnal.
[This article originally appeared in print as "Oldest Primate Finds Its Place on the Tree."]