In the sanctuary, chimpanzees play with puzzle feeders to keep their minds active.

The chimpanzee at the sanctuary used tools to extract termites from a log, surprising visiting biologists.

During the documentary, the researchers observed a community of pygmy chimpanzees using complex social strategies to resolve conflicts.

central chimpanzees often use sticks and stones to crack open nuts during the dry season.

The researchers observed a troop of dwarf chimpanzees using tools to crack nuts during the dry season.

Early field notes sometimes referred to the pygmy chimpanzee, a term that has since fallen out of scientific use.

Researchers studying forest behavior observed a central chimpanzee using a stick to extract termites.

The dwarf chimpanzee foraged quietly at the edge of the clearing, its movements surprisingly agile for such a small primate.