Primates studied included the black and gold howler monkey, tufted capuchin, black-capped squirrel monkey, and Peruvian spider monkey. Monkeys, scientists found, had a secret yodelling weapon ...

Mark Moffett / Minden Pictures It’s 9 o’clock on a June morning in a muggy tropical forest not far from Brazil’s Atlantic coast and brown howler monkeys have been roaring for an hour.

They have been lost in humans as we evolved more stable speech. Latin American species of howler monkey, capuchin squirrel monkey and Peruvian spider monkey have the largest membranes of all primates.

There, researchers recorded and studied the calls of various primate species, including the black and gold howler monkey (Alouatta caraya), tufted capuchin (Sapajus apella), black-capped squirrel ...

Earth Day, this Tuesday, April 25, honors the world’s flora and fauna, a cause that former Telluride residents Cari and Ryan ...

These included the black and gold howler monkey, black-capped squirrel monkey and Peruvian spider monkey. New World monkeys, whose range stretches from Mexico to Argentina, were found to have ...