Archives for June 15, 2026

Of the many reasons why chimpanzees engage in social grooming (also known as “allogrooming”), hygiene is thought to be one of the least important. Grooming appears to be much more about strengthening bonds, lowering stress levels, and gaining favors. But evidence suggests that hygiene still plays an important role, as chimps often concentrate on parts of the body that are less accessible to their grooming partners. Because of this, there generally aren’t any parts of the body that are off limits, including noses and backsides.