Here’s yet another similarity between monkeys and humans: They, like us, adapt their behavior to social situations and “peer pressure,” according to a new South Africa study. The researchers, who published their findings April 25 in the journal Science, reported observing vervet monkeys on a reserve eat foods that they normally would not touch whenever they saw other monkeys eating it.

As residents of a reserve, the monkeys were all living in a wild setting but were given daily helpings of corn by the human researchers, some of the corn servings dyed blue and others dyed pink. There were four separate groups of monkeys in total, split into four groups of 24 to 44 monkeys each—109 in all.