Krasilnikov Yu. I. RussiaMoscow regionWorking group on the restoration of the Black-headed Gull colony at the Kiyovo Lake, 30-95 Mirnaya Str., Lobnya, Moscow region 141731, Russiaserpkh@gmail.com Author's articles RESTORATION OF A BLACK-HEADED GULL (LARUS RIDIBUNDUS) (CHARADRIIFORMES, AVES) COLONY: THE ROLE OF RELEASERS IN THE FORMATION OF A NEW BIRD COLONY