Whether or not the individual monkeys were successful in getting the rest of the group to follow them didn't seem to relate to their age, sex or status. "Even the children can get the group moving," says Cédric Sueur, a graduate student who worked on the study with Petit.
The style of decision-making most frequently documented in the animal kingdom is dictatorial. In mountain gorillas, for example, the obedient tribe will follow the dominant male silverback. Horses, mongooses and wolves also follow despotic leaders. But theories are emerging which suggest that mammals who make democratic decisions may have an evolutionary edge because they can pool the experience of each group member.