Early Howler Monkeys Adapted to Eating Leaves 13 Million Years Ago
Fossil jaws of the ancient monkey species Stirtonia victoriae from the La Victoria Formation in Colombia suggest that…
Monkeys With Smaller Testicles Scream Louder to Compensate
Howler monkey in Santa Maria de Jetiba, Brazil. Photo by Paulo Chaves. It’s a long-held belief that loudmouths…