Also known as the sea pigeon, tystie and greenland dove, this medium-sized bird has two very different plumages.
Ducks, geese and swans
Winter visitors to the UK, formerly considered a full species, but now considered a sub-species of the Tundra Swan.
The Arctic Skua, also known as the Parasitic Jaeger, is a medium-sized seabird well known for its aggressive nature.
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