Gadwall

Mareca strepera

The gadwall is a common and widespread dabbling duck in the family Anatidae. Source

Where it is now

In the last 8 weeks this bird was recorded 195,538 times across 124 areas (each area is a 5 degree square).

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Movement and weather

Each season it is first heard regularly where daytime highs are around 20°C (typically 15 to 27°C, from 35 areas). That range is wide, so temperature alone does not explain when it turns up.

Over the weeks it was present in the past year, its centre in Europe ranged from 44°N in March to 59°N in February, about 1,600 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.