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First author Jessica Rosien '21 recorded nearly 1,300 instances of food-handling by 42 individual macaques over six weeks. Monkeys that washed their food devoted an average of five seconds to over a minute to each cucumber slice—often washing multiple slices—while the average amount of time spent just brushing sand off a slice was effectively zero, the researchers report. The researchers determined social rank using established methods of observing how the animals interact.
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Amanda Tan
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