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Ardi's a hominin--but how did she move?

Researchers gave Ardi, the oldest and most complete skeleton of a potential human ancestor, new recognition as a hominin. They agreed with the discoverers that Ardi walked upright—albeit in a weird way—and that features in her teeth and skull make her a primitive member of the human family. But debate raged about whether she also climbed vertically in trees like an ape.