Smew

Mergellus albellus

The smew is a species of duck and is the only living member of the genus Mergellus. The genus is closely related to Mergus and is sometimes included in it; genetic studies have shown that it is the sister taxon to Mergus and Lophodytes. The smew has hybridised with the common goldeneye. Source

Where it is now

In the last 8 weeks this bird was recorded 332 times across 9 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 56°N in February to 67°N in May, about 1,200 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.