Hermien (Female) steps into water to collect food from moat. Note, quadrupedal on land, bipedal (1 step, 4 sec) in water. In this short masters study bonobos were observed to move bipedally approximately 2-3% of the time on land, but about 90% of the time when they were (albeit rarely) in water.
Kuliukas, A. Wading for Food: The Driving Force of the Evolution of Bipedalism?. Nutrition and Health 16:267-289, (2002).
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