The Black-headed Gull can sometimes be seen flying overhead, or more likely gathering in the fields foraging. They are the smallest of our 4 most common gulls. They are called black-headed gulls, as they have characteristic black heads, but only in the summer. Their black heads can often look distinctly chocolate coloured, and doesn't extend all down the neck. In the winter, their colouring is much more subdued, with just a black spot behind the eye.