| CHIMPANZEES BOSSOU AND NIMBA

Coula nuts: unfamilliar nuts

Cracking open Coula nuts

Algae scooping

Ant dipping2

Palm wine

Use of leaves for drinking palm wine

Probing stick

Pestle-pounding in oil palms 1

Pestle-pounding in oil palms 2

Use of leaves for drinking water

Drinking tool 1

Drinking tool 2

The hole to observe drinking behavior 1

The hole to observe drinking behavior 2

Infant learning how to use a drinking tool