Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) four year old infant male, named Gizmo, foraging for insects in log, Gombe National Park, Tanzania

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand

Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand

Cyril Ruoso / Chimpanzee (Pan troglodytes) using stick to forage for prey in small tree cavity, Bossou, Guinea

Cyril Ruoso / Chimpanzee (Pan troglodytes) using stick to forage for prey in small tree cavity, Bossou, Guinea

ZSSD / Hawaiian Crow (Corvus hawaiiensis) using stick tool to reach food, native to Hawaii

ZSSD / Hawaiian Crow (Corvus hawaiiensis) using stick tool to reach food, native to Hawaii

D. Parer & E. Parer-Cook / Woodpecker Finch (Camarhynchus pallidus) using tool to dislodge grub, Santa Cruz Island, Galapagos Islands, Ecuador

Anup Shah / Bonobo (Pan paniscus) male using a rock to crack open nuts, tool use, Lola Ya Bonobo Sanctuary, Democratic Republic of Congo. October.

Gerry Ellis / Chimpanzee (Pan troglodytes) uses fishing tool to catch insects, Washington Park Zoo, Washington

Gerry Ellis / Chimpanzee (Pan troglodytes) teaching, young male to use fishing tool, Washington Park Zoo

Gerry Ellis / Chimpanzee (Pan troglodytes) teaching young male to use fishing tool, Washington Park Zoo