Maranhão red-handed howler

The Maranhão red-handed howler (Alouatta ululata) is an endangered species of howler monkey endemic to forests, for example Babaçu forests, in the northeastern Brazilian states of Ceará, Maranhão and Piauí. It was previously thought to be a subspecies of the red-handed howler, but unlike that species it is strongly sexually dichromatic, meaning males and females differ markedly in colour. It belongs to the genus Alouatta, the howler monkeys, within the family Atelidae. Its diet is folivorous and frugivorous, so it eats both leaves and fruit. The Global Biodiversity Information Facility lists its assessment on the IUCN Red List as Endangered.