Luiz Claudio Marigo / Northern Brown Howler monkey (Alouatta guariba guariba), climbing branch, lowland Atlantic Rainforest of Southern Bahia, Southern Bahia State, Eastern Brazil.

Luiz Claudio Marigo / Northern Brown Howler monkey (Alouatta guariba guariba), lowland Atlantic Rainforest of Southern Bahia, Southern Bahia State, Eastern Brazil. Endangered species.

Luiz Claudio Marigo / Northern Brown Howling monkey (Alouatta guariba guariba) portrait, Atlantic Rainforest of Southern Bahia State, Eastern Brazil.

Roland Seitre / Brown Howler Monkey (Alouatta guariba) baby, captive. Native to Argentina and Brazil.

Mark Bowler / Peruvian red uakari monkey (Cacajao calvus ucayalii) hanging by feet. Captive - Pilpintuwasi Animal Orphanage, Peru.

Mark Bowler / Red Howler Monkey (Alouatta seniculus) hanging by tail with non-prehensile tailed Peruvian red uakari monkey (Cacajao calvus ucayalii). Captive at Pilpintuwasi Animal Orphanage, Padre Cocha, Iquitos,...

Claus Meyer / Brown Howler Monkey (Alouatta fusca) baby calling, southern Brazil