Video: Crow goes sledding down rooftop

People, including scientists, have wondered for ages how intelligent crows are; alternately, under what conditions crows (or other animals) ever use tools as humans do. A recent video, shot at long distance in an uncontrolled situation, shows striking evidence of this. A crow finds a jar lid and takes it up to a snowy rooftop, where it stands on the lid and sleds down the roof. It then picks up the lid, returns to the rooftop, and sleds down again. Repeatedly.