Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) sixteen month old baby female, named Gossamer, in tree, Gombe National Park, Tanzania

Chien Lee / Pygmy Anteater (Cyclopes didactylus) mother and young, Esmeraldas, Ecuador

Chien Lee / Arfak Ringtail (Pseudochirulus schlegeli), Arfak Mountains, West Papua, Indonesia

Michael Quinton / American Marten (Martes americana) emerging from tree cavity, Alaska

Michael Quinton / American Marten (Martes americana) sleeping in tree cavity, Alaska

Thomas Marent / Cotton-top Tamarin (Saguinus oedipus) with red pollen after feeding on flower nectar, Tayrona National Natural Park, Colombia

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

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

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

Suzi Eszterhas / Pygmy Three-toed Sloth (Bradypus pygmaeus) mother and three month old young, Isla Escudo de Veraguas, Panama

Suzi Eszterhas / Pygmy Three-toed Sloth (Bradypus pygmaeus) mother and three month old young, Isla Escudo de Veraguas, Panama

Suzi Eszterhas / Pygmy Three-toed Sloth (Bradypus pygmaeus) mother and four month old young, Isla Escudo de Veraguas, Panama