At least not internally, spider monkeys have been observed pulling back a branch hand over hand using multiple muscle strokes stored in the bend of the branch to catapult themselves forward.

至少在内部是这样，人们观察到蜘蛛猴利用储存在树枝弯曲处的多次肌肉动作，一只手一只手地拉回一根树枝，从而使自己向前弹射。