Two new faces at the Zoo! We now have black and gold howler monkeys! Come see Helen and Hayden a mother/daughter pair in Jungle Trails on your next visit. Howlers are named for the loud howls, grunts, roars and barks they use to defend territory. The Cincinnati Zoo supports howler monkey conservation work in Costa Rica by sending staff members to the region to assist researchers with the collection of biological information from animals living in the canopies of the lowland forests of the Guanac