Razorbill

Alca torda

The razorbill is a North Atlantic colonial seabird and the only extant member of the genus Alca of the family Alcidae, the auks. It is the closest living relative of the extinct great auk. Historically, it has also been known as "auk", "razor-billed auk" and "lesser auk". Source

Where it is now

In the last 8 weeks this bird was recorded 629 times across 18 areas (each area is a 5 degree square).

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Movement and weather

Over the weeks it was present in the past year, its centre in Europe ranged from 60°N in November to 72°N in June, about 1,300 km apart.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.