Paul Williams / Bonnet macaque (Macaca radiata) adults and baby in temple, Hampi, Karnataka, India, July.

Paul Williams / Bonnet macaque (Macaca radiata) male standing on road barrier, Vaparai, Tamil Nadu, India, July.

Paul Williams / Bonnet macaque (Macaca radiata) male grooming female, Vaparai, Tamil Nadu, India, July.

Barry Bland / Barbary macaques (Macaca sylvanus) with baby, Rock of Gibraltar.

Barry Bland / Barbary macaques (Macaca sylvanus) mother holding baby with another playing with the baby, Rock of Gibraltar.

Barry Bland / Barbary macaque (Macaca sylvanus) mother holding newborn baby macaques, Rock of Gibraltar.

Barry Bland / Barbary macaques (Macaca sylvanus) with baby, on the Rock of Gibraltar, July.

Barry Bland / Barbary macaques (Macaca sylvanus) baby held by adult, Rock of Gibraltar.

Barry Bland / Barbary macaques (Macaca sylvanus) holding baby macaques, Rock of Gibraltar.

Paul Williams / Red leaf monkey (Presbytis rubicunda) mother and baby, Danum Valley, Sabah, Borneo, Malaysia August.

Paul Williams / Red leaf monkey (Presbytis rubicunda) mother and baby, Danum Valley, Sabah, Borneo, Malaysia August.

Kevin Schafer / Guatemalan Black Howler Monkey (Alouatta pigra) male. Community Baboon Sanctuary, Belize, Central America. Endangered species.