Mine!
Upon their return from a fishing trip, the hard work has only just begun for puffins. As they approach their burrows they are chased by gulls both in the air and on the ground as they scurry towards the safety of their nests.
In this image, the puffin is being mobbed by a yellow-legged gull, with a black-headed gull in the background.
Canon 7D Mk2, Canon 100-400mm Mk2, 1/2000s @ f7.1, ISO 400