I have always heard that crows are very intelligent. My whole family attended a presentation by the Utica Zoo last year that detailed how birds in New York city would actually put nuts in the street for cars to run over so they could enjoy the food. After determining that this was too dangerous (or they were just tired of dodging New York City drivers), the birds started placing the nuts in the crosswalks where people would step on the nuts and crack them open.

With that said I didn't think crows enjoyed winter sports, but appartently they do. This particular smart crow has some pretty solid tubing skills!