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The oil palm

©ANC Productions Inc. and Primate Research Institute, Kyoto University.

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Making palm oil

Making palm oil

Hand preference

Hand preference

Nut-cracking

Choice of tools

Choice of tools

Changing hammer stone

Changing hammer stone

Brittle stones

Inadequate hammer

Inadequate hammer

Stabilizing the anvil stone

Stabilizing the anvil stone

Other ways of stabilizing the anvil

Other ways of stabilizing the anvil

Metatool: wedge stone use

Metatool: wedge stone use

Transporting stone tools

Transporting stone tools

How to obtain stone tools?

How to obtain stone tools?

Retrieving stone tools

Retrieving stone tools

Deception

Deception

Nut-cracking can be dangerous

Nut-cracking can be dangerous

Carrying nuts

Competent nut-crackers

Competent nut-crackers

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