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They found that two large, bipedal species, the eastern grey kangaroo and the red kangaroo, exhibited left-handedness in all tasks, including supporting the body with one forelimb in a tripedal stance.

Tripedal, trip′e-dal, or trī′ped-al, adj. having three feet.

However, wallabies tended to prefer using their right hands to support themselves in the tripedal position – perhaps freeing up their left hands for feeding.

"I don't discern," replied the first, "how the contemplation of unipedal misery tends to alleviate tripedal wretchedness."