Common Grasshopper Warbler

Locustella naevia

The common grasshopper warbler or just grasshopper warbler is a species of Old World warbler in the genus Locustella. It breeds across much of temperate Europe and the western Palearctic. It is migratory, wintering across northern tropical Africa just south of the Sahara, and also locally in India. Source

Where it is now

In the last 8 weeks this bird was recorded 980 times across 20 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 12 to 19°C, from 12 areas).

Over the weeks it was present in the past year, its centre in Europe ranged from 39°N in June to 60°N in April, about 2,400 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.