Great Reed Warbler

Acrocephalus arundinaceus

The great reed warbler is an insectivorous bird in the family Acrocephalidae. It is a medium-sized passerine bird and the largest of the warblers. It breeds throughout mainland Europe and the Western Palearctic and migrates to sub-Saharan Africa in the winter. It favours reed beds during the breeding season, while living in reed beds, bush thickets, rice fields, and forest clearings during the winter. It exhibits relatively low sexual dimorphism, and the sexes are similar in appearance. This species mates both polygynously and monogamously. Source

Where it is now

In the last 8 weeks this bird was recorded 108 times across 12 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 10 to 19°C, from 9 areas).

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.