Juan Manuel Borrero / White bald-headed uakari (Cacajao calvus) head portrait. Amazon basin. Iquitos. Loreto. Peru, Captive

Claus Meyer / Red Uakari (Cacajao rubicundus) male feeding on fruit, Amazon ecosystem, Brazil

Sylvain Cordier / Bald uakari (Cacajao calvus) Amazonas, Brazil.

Sylvain Cordier / Bald uakari (Cacajao calvus) Manaus, Amazon, Brazil.

Nick Garbutt / White-fronted Capuchin Monkey (Cebus albifrons) in forest canopy, Paujil Nature Reserve, Magdalena Valley, Colombia, South America.

Will Burrard-Lucas / Cuban Amazon (Amazona leucocephala) taking off, Grand Cayman Island, Cayman Islands.

Will Burrard-Lucas / Cuban Amazon (Amazona leucocephala) perched, Grand Cayman Island, Cayman Islands.

Ingo Arndt / Red Uakari (Cacajao calvus) female in tree, Amazon Ecosystem, Brazil

Ingo Arndt / Red Uakari (Cacajao calvus) male, Amazon Ecosystem, Brazil

Ingo Arndt / Red Uakari (Cacajao calvus) male in tree, Amazon Ecosystem, Brazil

Ingo Arndt / Red Uakari (Cacajao calvus) calling, Amazon Ecosystem, Brazil

Ingo Arndt / Red Uakari (Cacajao calvus) female in tree, Amazon Ecosystem, Brazil