Lesser Whitethroat

Curruca curruca

The lesser whitethroat is a common and widespread Old World warbler which breeds in temperate Europe, except the southwest, and in the western and central Palearctic. This small passerine bird is strongly migratory, wintering in Africa just south of the Sahara, Arabia and India. Source

Where it is now

In the last 8 weeks this bird was recorded 3,300 times across 29 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 15°C (typically 11 to 16°C, from 20 areas). That holds across 25° of latitude, which suggests its timing follows temperature more than the calendar.

Over the weeks it was present in the past year, its centre in Europe ranged from 49°N in April to 59°N in July, about 1,100 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.