Black-legged Kittiwake
Famous for building precarious nests on the sheerest of cliffs
What you need to know about the Black-legged Kittiwake
Our Expert Says… "These kittiwakes choose the most inaccessible, narrow and sloping ledges to lay their eggs away from the reach of all predators. Although they have to construct the nest such that the eggs won't roll off the cliff, the lack of predation means they only need to expend the energy required to lay two eggs, unlike most other gulls who lay three or more."
The black-legged kittiwake is a vulnerable species of coastal seabird. Although its current numbers are estimated at around 15,000,000 individuals it has been in constant decline, with numbers thought to be down 40% since 1970.
Found in the arctic and subarctic regions of Europe and North America, the black-legged kittiwake grows to around 38cm (15”) long with a wingspan of about 1m (40”). They have a white body and head with a gray back and wings and a yellow bill, and of course black legs.
Black-legged kittiwakes nest in large colonies on cliffs, and they can use even sheer faces as they can nest on the smallest of ledges and crevices. The birds work as a pair to make a nest using mud and other materials that will prevent the eggs from rolling out of the sometimes precarious sites they choose. Unlike most gulls, they only lay 2 eggs. Their breeding season starts in June and is usually complete by August.
Kittiwakes are fish-eaters, although they are not divers. They forage at the surface, either by swimming or by catching prey in flight. Outside the breeding season, they spend their entire time out at sea and thus have a wide foraging range. They are flocking birds, and it’s rare to see them on their own, even outside of the breeding colonies.