River Warbler

Locustella fluviatilis

The river warbler is an Old World warbler in the genus Locustella. It breeds in eastern and central Europe and is migratory, wintering in inland southern Africa, from around the Zambezi River south to the vicinity of Pretoria in South Africa. Source

Where it is now

In the last 8 weeks this bird was recorded 1,013 times across 4 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 21°C (typically 12 to 23°C, from 7 areas). That range is wide, so temperature alone does not explain when it turns up.

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.