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Rissa tridactyla (Black-legged Kittiwake)

English: Black-legged Kittiwake, Kittiwake
Russian: Моевка, Трехпалая чайка
Mongolian: Гурванхуруут захлай
German: Dreizehenmowe
French: Mouette tridactyle
Japanese:  ミツユビカモメ (Mitsuyubi-kamome)

Body length: 37-42 cm.
Wing span: 93-105 cm.

Rarely seen far from sea. Breeds colonially (at times several tens of thousands of pairs) on steep sea-cliffs, sometimes on buildings. Common near colonies and fishing ports, or boats at sea. Foods invertebrates and fish, including waste from commercial fishing.

Identification: Three age-groups. A trifle larger than Black-headed, with slight notch in tail and short legs. Stiff, quick wingbeats and narrow outer wing give less ‘lazy’, more tern-like flight than other gulls.

  • Adult: Small black triangle on wing-tip; dark grey upperparts shade to whitish before black wing-tip, adding to distinctiveness of almost three-coloured wing pattern; bill yellowish; legs dark brown or blackish (rarely red, orange or flesh); head white in summer, with grey hindneck and crescentic blackish ear-spot in winter. 1st year: Dark ‘W-pattern’ across wings and black tail-band; juvenile and some 1st winters have white head with black ear-spot and black half-collar; otherwise head as adult winter; ‘W’ often much faded by 1st summer, and bill becomes dull yellowish with dark marking at tip.
  • Juvenile/1st -winter similar to 1st -year Little Gull but, with practice, recognized by different structure (Kittiwake is bigger-headed) and flight action. Kittiwake is darker grey above, has cleaner white rear portion of wing, and lacks Little Gull’s dark cap and small black patch where under secondaries meet body. 2nd -year: Like adult, but told at close range by e.g. black fringes on outermost primaries, some black on bill, or winter head pattern in summer.
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