Ik twijfelde of Ross' Meeuw echt een regelmatige broedvogel op Groenland is. Heb het even nagevraagd bij David Boertmann. Op mijn vraag of Ross' Meeuw op Groenland broedt schrijft hij:
We actually do not know. The two sites, with most breeding records (Grønne Ejland in Disko Bay and Henrik Krøyer Holme in the Northeast Water) are not visited regularly. The most recent visit by ornithologists on Henrik Krøyer Holme was in 2017, and they did not find any Ross's gulls during a weeks stay. However, they only visited one of the three islands in the archipelago. I have been at Grønne Ejland several times without finding any Ross's gulls.
It is most reasonable to conclude that Ross's gull do not breed regularly in Greenland, and when it does, it is only a few pairs.
Of de Belgische (en Nederlandse) Ross' Meeuwen van Groenland komen? Denk het niet.