Macaque washing (IMAGE)
Caption
Macaques on Thailand’s Koram Island may engage in food-washing based on their social rank. The researchers set trays of sliced cucumber mixed with varying amounts of sand on the beach to observe how thoroughly the animals cleaned their food before eating it. They found that lower-ranked animals (pictured) first washed their cucumber slices in the ocean, often well past the point it was clean.
Credit
Amanda Tan
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