Adults have gray backs, dark wingtips, flesh-colored legs, and a yellow bill with a red spot.
Immature gulls are more dusky in appearance, because they haven t yet acquired the gray mantle of the adult. Black-backed gulls are larger than herring gulls. They have a black back and wings and snowy-white underparts. Immature gulls are lighter than their adult counterparts, but are less brown than juvenile herring gulls. Wilson s storm petrels can often be seen hovering near the water, or even walking on the water with their feet as they forage.