三趾鷗 Rissa tridactyla

Small oceanic gull. Adults have solid black wingtips that look like they were dipped in ink. Also note translucent flight feathers, entirely yellow bill, and black legs. Nonbreeding birds have a dark ear patch and smudgy gray on the back of the neck. Immatures are boldly patterned with a black collar and “M” pattern on wings. Rather buoyant in flight, sometimes soaring in high arcs in windy conditions. Breeds at high latitudes across the Northern Hemisphere, primarily in large colonies on cliffs and other structures overhanging water. Spends the winter on the open ocean, sometimes seen from shore. Rare inland. Can gather in flocks during migration and winter, especially where food is abundant.