Which one of the following makes a tool with a stick to scrap insects from a hole in a tree or a log of wood?

1. A

   Fishing cat

   Fishing cat. A wetland cat; it does not stick-tool for insects in logs.

2. B

   Orangutan

   Orangutan. Documented stick tools to extract insects and honey from holes.

3. C

   Otter

   Otter. Uses stones on shellfish in some populations, not this stick-in-hole habit as the textbook case.

4. 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.