A brown lemur with a long tail walking on a rope in a dark environment, Doncaster, Yorkshire, England, United Kingdom, Europe

Brown capuchin monkey (Cebus apella) (Sapajus apella) on tree, Tambopata National Reserve, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Brown capuchin monkey (Cebus apella) (Sapajus apella) on tree, Tambopata National Reserve, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Brown capuchin monkey (Cebus apella) (Sapajus apella) on tree, Tambopata National Reserve, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Hamadryas baboon (Papio hamadryas), along the road from Massawa to Asmara, Eritrea, Africa

Chimpanzee (Pan troglodytes), Gombe Stream National Park, Lake Tanganyika, Tanzania, East Africa, Africa

Female mantled howler monkey (Alouatta palliata) eating tree leaves in a north Pacific coast forest, Esperanza, Nosara, Guanacaste, Costa Rica

Geoffroys marmoset. Callithrix geoffroyi. captive adults. Newquay zoo Cornwall UK. More info: status: least concern but numbers declining due to habitat destruction, pet trade, zoos, biomedical research and persecution.

Ebola virus particles (blue) found both as extracellular particles and budding particles from chronically infected African green monkey kidney cells. Image captured and color-enhanced at the NIAID Integrated Research Facility in Ft. Detrick, Maryland.