Several species of large gulls, water birds, inhabit the northern hemisphere. They are acrobats of the wind and surf making a noisy display at the seashore. These birds are omnivorous and voracious. They feed on fish, amphibians, crustaceans and even nestlings of other birds, also of the same species. In search of food they perform patrol flights, seeking crustaceans or small fish that have been stranded, they strike from the height of 5 meters and catch their prey by diving under the surface of the water. In winter they look for food near the fishing boats and in landfills, it also happens that they steal food from tourists enjoying their rest at the seaside.