Crows have long been recognized for their intelligence. Lately, the crow's ability to make and to use tools has been acquiring this bird a great deal of attention and scientific study.
In this video you'll see a crow pick up the lid to a jar, set it down on the apex of a snow-mottled roof and slide down one side, carefully keeping its feet on the lid until it gets to the bottom. Then it picks up the lid, flies back to the apex, tests out another face of the roof, finds it lacking, returns to the original position, and slides down again.
YouTube link
More about this video at The Atlantic.The Presurfer