The Great Black-backed Gull on the run has just snatched the other gull’s clam. The victim had dropped the clam from a height in order to crack the shell. But the thief flew in and grabbed it before he could swoop down to pick it up. A younger bird is following the action to see if it can grab the loot while the other two squabble. Very typical gull behavior.
Birds in My Viewfinder 