The drama unfolds on the shore often over food. Sanderlings feed on little invertebrates, worms and shrimps at low tide. The Black-headed gulls have worked out it is easier to steal a meal rather than catch their own.
A Sanderling weight is 50 -60 grams and a Black-headed gull’s weight is 200-400g so the gull is the bully but the Sanderling is extremely fast so they do not give up their meal that often.
Continued Reflections from my World. 
Those gulls can be bullies sometimes, honing in on any scrap of food they can. Look at their angry faces and open beaks!
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