Arctic Tern

This tern mobbed me as I walked along the track to Mull Head reserve in Deerness.
Often they'll do that when there are chicks nearby but in this case it seemed to be trying to distract me from its mate which was in the grass. Looking through binoculars I could see that it had a broken right wing. Ther is an enormous wind turbine nearby and I wonder if the bird had collided with it. Later on the reserve I was mobbed by great skuas. I watched two of them chase a raven which had stolen an egg. Other ravens, probably family, helped the raven escape the attentions of the skuas. See a couple of shots here.