Ernie Janes / Black howler (Alouatta caraya) captive, occurs in South America. Foliage digitally added.

Claudio Contreras / Mantled howler monkey (Alouatta pigra), Yaxchilan Natural Monument, Lacandon Rainforest, southern Mexico, July. Medium repro only

Claudio Contreras / Mantled howler monkey (Alouatta pigra), Yaxchilan Natural Monument, Lacandon Rainforest, southern Mexico, July

Claudio Contreras / Mantled howler monkey (Alouatta pigra), Yaxchilan Natural Monument, Lacandon Rainforest, southern Mexico, July

Andy Rouse / Black Howler Monkey (Alouatta caraya) howling , Pantanal, Brazil

Claudio Contreras / Yucatan black howler monkey (Alouatta pigra) orphan in process of reintroduction to the wild, Yucatan Black Howler Monkey conservation program, Los Aluxes Ecopark, Palenque, Chiapas, southern Mexico....

Hermann Brehm / Black Howler Monkey (Alouatta caraya) in tree, Pantanal, Brazil

Gabriel Rojo / Black howler monkey (Alouattacaraya) male and female in tree, Ibera Marshes, Corrientes Province, Argentina

Nick Garbutt / Black howler monkey (Alouatta caraya) resting in riverine forest canopy. Tributary of Cuiaba River, Mato Grosso, Pantanal, Brazil. September.

Claudio Contreras / Yucatan black howler monkey (Alouatta pigra), Calakmul Biosphere Reserve, Yucatan Peninsula, Mexico. August. Critically endangered species.

Kevin Schafer / Guatemalan Black Howler Monkey (Alouatta pigra) male. Community Baboon Sanctuary, Belize, Central America. Endangered species.

Kevin Schafer / Guatemalan Black Howler Monkey (Alouatta pigra) Community Baboon Sanctuary, Belize, Central America. Endangered species.