Black-legged Kittiwake
Rissa tridactyla

f4 @ 1/2500s, ISO:1250, Nikon D3S w 500mm

"Black-legged Kittiwake," Wikipedia, the free encyclopedia. Cliff nesting for gulls occurs only in the Rissa species, and the kittiwake is capable of utilizing the very sheerest of vertical cliffs, as is evident in their nesting sites on Staple Island in the outer Farne Islands. One to two buff spotted eggs are laid in the nest lined with moss or seaweed.
St. Paul, Pribilof Islands, Alaska