A bird with expensive taste

On Mull last month we watched a Hooded Crow fly upward and drop something onto loch-side rocks. The bird would then fly down, pick up the object and drop it again; Lammergeyer like. Upon closer inspection the object was seen to be an oyster. The crow repeated the process until the oyster cracked open; it then ate the contents and then started the procedure all over again with another. Damn clever these corvids.