If you live by a large area of water you may want to know what do seagulls eat. These birds are white in color and have a gray or black coloring on each of their wings. But baby seagulls are an all over brown or gray color. They live off of costal areas, on beaches and can be found at many dump sites. They can also be found flying over the open ocean. Although they do prefer to be in these areas, they will go where ever they can find food.