Christophe Courteau / Black Howler Monkey, female jumping from branch to branch (Alouatta caraya) Pantanal. Brazil. sequence 4/4

Christophe Courteau / Black Howler Monkey, female jumping from branch to branch (Alouatta caraya) Pantanal. Brazil. sequence 3/4

Christophe Courteau / Black Howler Monkey, female jumping from branch to branch (Alouatta caraya) Pantanal. Brazil. sequence 2/4

Christophe Courteau / Black Howler Monkey, female jumping from branch to branch (Alouatta caraya) Pantanal. Brazil. sequence 1/4

Claudio Contreras / Yucatan Black Howler Monkey (Alouatta pigra) prehensile tail detail, El Mirador-Rio Azul National Park, Department of Peten, Guatemala, October. Endangered species.

Claudio Contreras / Yucatan Black Howler Monkey (Alouatta pigra), Calakmul Biosphere Reserve, Yucatan Peninsula, Mexico. Endangered species.

Claudio Contreras / Yucatan Black Howler Monkey (Alouatta pigra) in tree, Calakmul Biosphere Reserve, Yucatan Peninsula, Mexico, November. Endangered species.

Claudio Contreras / Yucatan Black Howler Monkey (Alouatta pigra) with baby, Calakmul Biosphere Reserve, Yucatan Peninsula, Mexico, October. Endangered species.

Will Watson / Two female Mantled / Golden howler monkeys (Alouatta palliata) with an infant in tree canopy, Lalo Loor Reserve, Manabi province, Ecuador.

Ben Lascelles / Mantled howler monkey (Alouatta palliata aequatorialis) female and baby, Soberania National Park, Panama

Ben Lascelles / Mantled howler monkey (Alouatta palliata aequatorialis) in tree, Soberania National Park, Panama

Ben Lascelles / Mantled howler monkeys (Alouatta palliata aequatorialis) feeding in tree, hanging from tails, Soberania National Park, Panama