I think it was a David Attenborough programme that showed crows doing some extraordinary things.
One I recall was that they would pick up a nut that was hard to crack. They'd stand by the side of the road and wait for the traffic lights to stop the cars, then they'd hop into the road and place the nut about 2ft in front of a car wheel, and hop back onto the pavement. The lights go green and the car moves forward and breaks the nut. The crow waits for the lights to turn red again before hopping out into the road and collecting his broken nut.