Since 2012 Dubuc and colleagues from New York University have studied more than 250 free-ranging rhesus macaques at a field site in the Caribbean. The goal: to learn how face color—which varies ...

Scalp retraction with ears flat invites play or grooming. Chuckles, rattles, grunts, and barks—macaque talk—each have context-dependent meaning. Tyrrell follows macaques from sunrise to sunset ...