Heuglin's gull

Heuglin's gull, or the Siberian gull (Larus fuscus heuglini), is a seabird in the genus Larus. It is sometimes considered as a separate species (Larus heuglini) but is usually treated as a subspecies of the lesser black-backed gull. Birds in the eastern part of Heuglin's gull's range are often paler grey above and sometimes considered to be a separate subspecies Larus fuscus taimyrensis (Taimyr gull). It is now thought that they are a result of hybridisation between Heuglin's gulls and Vega gulls.