Thomas Marent / Gray-handed Night Monkey (Aotus griseimembra) trio in tree cavity, Magdalena Valley, Colombia

Thomas Marent / Gray-handed Night Monkey (Aotus griseimembra) trio in tree cavity, Magdalena Valley, Colombia

Roland Seitre / Grey-handed Night Monkey (Aotus griseimembra) captive in zoo, Pereira, Risaralda, Colombia. Vulnerable species. Native to Colombia and Central America.

Roland Seitre / Grey-handed Night Monkey (Aotus griseimembra) captive in zoo, Pereira, Risaralda, Columbia. Vulnerable species. Native to Colombia and Central America.

Rod Williams / Douroucouli / Grey legged night monkey (Aotus lemurinus) young female, Captive, occurs South Panama to Eastern Brazil, South America.

Rod Williams / Grey legged douroucouli/ night monkey {Aotus lemurinus griseimembra} captive, endangered species

Thomas Marent / Gray-handed Night Monkey (Aotus griseimembra) trio in tree, Magdalena Valley, Colombia

Joel Sartore / Photo Ark / Colombian night monkey (Aotus griseimembra) head portrait, Houston Zoo. Captive, occurs in Colombia and Venezuela.