Explanation
- A
Fishing cat
Fishing cat. A wetland cat; it does not stick-tool for insects in logs.
- B
Orangutan
Orangutan. Documented stick tools to extract insects and honey from holes.
- C
Otter
Otter. Uses stones on shellfish in some populations, not this stick-in-hole habit as the textbook case.
- D
Sloth bear
Sloth bear. Tears termite mounds with claws, not a crafted stick probe.
Summary. Official key is (b) orangutan. Wild orangutans (and chimpanzees) use sticks as tools to probe holes for insects. Fishing cats, otters and sloth bears forage differently.
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