کاکایی پشت سیاه بزرگ (The Great Black -Backedd Gull)

The Great Black-backed Gull, Larus marinus, is a very large gull which breeds on the European and North American coasts and islands of the North Atlantic.The Great Black-backed Gull was one of the many species originally described by Linnaeus in his 18th century work, Systema Naturae, and it still bears its original name of Larus marinus.It is 61-74 cm (24-28 in) long with a 1.4-1.7 m .

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