Researchers find positive visual contagion in Barbary macaques
(PHYSorg.com Biology)

A pair of researchers at the University of Roehampton has found that captive Barbary macaques are capable of engaging in positive visual contagion-a behavior normally only seen in humans. In their paper published in Proceedings of the Royal Society B, Juliette Berthier and Stuart Semple describe their experiments with Barbary macaques living in a park in the U.K. and what they learned from it.