Crows are insanely intelligent and they know it. They love farking with other animals (and sometimes humans), and the interesting thing about crows is they can teach other crows how to pull pranks, so you can get generations of crows refining their antics as time goes on.

They are devious farking bastards.

/(one of my favorite stories is how crows crack nuts. Usually they just carry them high and let them go. This is inefficient, however -- sometimes the nuts crack and sometimes they don't. So crows found a better war -- cars. Crows drop nuts in front of cars and let cars drive over them. It's tough to get to crushed nuts on busy streets however, so they found a better method: Intersections. They hang around on the wires, wait til light turns green, drop nuts. Cars drive over nuts, light turns red, cars stop, crows pick up nuts. If you ever pass through an intersection and you see a bunch of crows just chilling out on a wire, now you know what they're doing)