Gerry Ellis / Chimpanzee (Pan troglodytes) orphan Larry playing in forest nursery, Ape Action Africa, Mefou Primate Sanctuary, Cameroon

Juergen & Christine Sohns / Meerkat (Suricata suricatta) pair on alert, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / Meerkat (Suricata suricatta) scratching itself, Tswalu Game Reserve, South Africa

Donald M. Jones / Black-tailed Prairie Dog (Cynomys ludovicianus) pair greeting, South Dakota

Donald M. Jones / Black-tailed Prairie Dog (Cynomys ludovicianus) pair greeting, South Dakota

Jami Tarris / Japanese Macaque (Macaca fuscata) in hot spring, Jigokudani, Nagano, Japan

Suzi Eszterhas / Giant Panda (Ailuropoda melanoleuca) six-to-eight month old cub in tree, Chengdu, China

Nate Chappell/ BIA / Belding's Ground Squirrel (Spermophilus beldingi) young playing, Oregon

Richard Du Toit / Burchell's Zebra (Equus burchellii) pair nuzzling, Rietvlei Nature Reserve, South Africa

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) juvenile male, five years old, Gombe National Park, Tanzania

Donald M. Jones / Mountain Goat (Oreamnos americanus) kids nuzzling, western Montana

Thomas Marent / Bonobo (Pan paniscus), Lola Ya Bonobo Sanctuary, Democratic Republic of the Congo