Of course, by now, everyone has heard of the crows that were being tested for ability to use tools. The humans had made a hook-shaped took for crows to use to get goodies out of a container. The male stole the female's hook. The female found a length of wire and bent it into a hook shape and went right back to pulling the goodies out of the container.

Also, the Japanese crows who routinely place nuts under the wheels of cars stopped at red lights and back off till the light changes; the cars drive over the nuts, cracking the shells and the crows go back to reap the rewards.