These vocal primates are the biggest of all the New World monkeys. Unlike Old World monkeys, howlers and other New World species have wide, side-opening ... helpful to howler monkeys because ...

My adventure of a lifetime began in 2015 when I was asked to follow the tree-top lives of Costa Rica’s gravity-defying howler monkeys (Alouatta palliata palliata). Image by Justine Allan.

CAPE MAY COURT HOUSE, N.J. (WPVI) -- The Cape May County Park and Zoo is introducing its newest resident: a 6-year-old male black howler monkey named Diego. Diego came from a zoo in Ohio to be a ...