Why do chimpanzee groups use different kinds of tools?

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A common chimpanzee (Pan troglodytes) sits on a rock holding a long blade of grass in its mouth, with dense green foliage in the background. — chimpanzee The West African, or masked, chimpanzee (*Pan troglodytes verus*) is a critically endangered subspecies of chimpanzee.

Chimpanzees exhibit regional variations in their tool-use repertoires, which are primarily driven by culture. Rather than being innate, these behaviors are passed down through generations via social learning, where younger animals acquire specific techniques from their elders.1

Because these traditions are shared among members of a specific group, different populations develop unique methods for tasks such as foraging or processing food. For instance, chimpanzees in the Congo basin may utilize a "tool set"—using a stout stick to dig into a termite mound before switching to a slender wand to fish for insects—while groups in the Guinea region employ "tool composites," such as using sticks to retrieve water-soaked sponges from tree hollows. These local differences in tool use reflect the transmission of group-specific knowledge rather than universal species-wide behavior.1