Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) four year old infant male, named Gizmo, foraging for insects in log, Gombe National Park, Tanzania
00582467
Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
00582444
Cyril Ruoso / Long-tailed Macaque (Macaca fascicularis) using stone tool to break shell, Khao Sam Roi Yot National Park, Thailand
00582377
Cyril Ruoso / Chimpanzee (Pan troglodytes) using stick to forage for prey in small tree cavity, Bossou, Guinea
00582375
Cyril Ruoso / Chimpanzee (Pan troglodytes) using stick to forage for prey in small tree cavity, Bossou, Guinea
01465986
Konrad Wothe / Chimpanzee (Pan troglodytes) in a tree using pieces of grass to pull ants from a hole to eat, Mahale Mountains National Park, Tanzania.
01465984
Konrad Wothe / Chimpanzee (Pan troglodytes) in a tree using pieces of grass to pull ants from a hole to eat, with a baby in the background, Mahale Mountains National Park, Tanzania.
01465982
Konrad Wothe / Chimpanzee (Pan troglodytes) in a tree using pieces of grass to pull ants from a hole to eat, Mahale Mountains National Park, Tanzania.
01465979
Konrad Wothe / Chimpanzees (Pan troglodytes) in a tree using pieces of grass to pull ants from a hole to eat, Mahale Mountains National Park, Tanzania.
00564020
ZSSD / Hawaiian Crow (Corvus hawaiiensis) using stick tool to reach food, native to Hawaii
00564018
ZSSD / Hawaiian Crow (Corvus hawaiiensis) using stick tool to reach food, native to Hawaii
01507393
Ole Jorgen Liodden / Woodpecker finch (Camarhynchus pallidus) using stick as a tool for foraging, Galapagos. Endemic.