Heuglin's Gull (L. heuglini / antelius)
(last update:
Heuglini breeding and winter grounds.
The green spot is the colony of Ivanovo Oblast. This location holds colonies where large white-headed gulls show various phenotypics within single colonies. Some birds strongly resemble cachinnans in upperpart grey tone, head and bill shape, wingtip pattern and call, while other birds strongly resemble heuglini or barabensis.
