a crow too close

I have a fascinations with Magpies. I like Ravens too. Now I find myself in Vancouver B.C. were they have neither although a large number of Crows. Now I study Crows to see if there is familiy resemblance. On sunny days I sit by the beach and whatch them get sea shells from the ocean. To get them open they jump up in the air and drop them onto rocks. This usually take a few try´s but they manage. The Seagulls whatch them in awe but to not pick up on the method. Once the Crow is done with a shell the Seagull follows to check for leftovers.