Anup Shah / Vervet monkey (Cercopithecus aethiops) male scratching itself - remote camera . Masai Mara National Reserve, Kenya.

Wim van den Heever / Vervet Monkey (Chlorocebus pygerythrus) baby jumping between branches, photographed mid air. Okavango Delta Botswana.

Danny Green / Snow Monkey (Macaca fuscata) with snow covered paw in front of mouth, Nagano, Japan, February

Danny Green / Snow Monkey (Macaca fuscata) in snow, Nagano, Japan, February

Danny Green / Snow monkey (Macaca fuscata) close up with eyes cast down, Nagano, Japan, February

Danny Green / Japanese Macaque (Macaca fuscata) carrying young on back through snow, Nagano, Japan, February

Danny Green / Japanese Macaque (Macaca fuscata) carrying young on back through snow, Nagano, Japan, February

Chris Mattison / Barred leaf frog (Phyllomedusa tomopterna) captive from South America.

Michael D. Kern / Waxy monkey tree frog (Phyllomedusa sauvagii) captive, from Central and South America

Pete Oxford / Giant leaf frog (Phyllomedusa bicolor) climbing along branch in rainforest, Iwokrama Reserve, Guyana

Yukihiro Fukuda / Japanese macaque / Snow monkey {Macaca fuscata} male grooming female in courtship in Japanese green alder tree {Alnus firma}, autumn, Jigokudani, Nagano, Japan

Gerry Ellis / Black-faced Vervet Monkey (Cercopithecus aethiops) pair playing on camera and tripod, Barbados, Caribbean, native to East and southern Africa