It is very similar to the argerated gull in general, perhaps a little darker the mantle and the red pint of the bill a little larger. Although the main difference is in the legs that are yellow and in the arsese are pink. The male is the same as the female, perhaps a little larger in size. In winter the adult bird has no dark speckling on the head or neck.
To nest prefer sea cliffs or islands near the coast, but in general it can occupy a variety of sites such as beaches, wetlands… it is also quite common in the vicinity of nuclei of coastal populations, where it can even grow in human buildings.