Marsh Wren

Cistothorus palustris

The marsh wren is a small North American songbird of the wren family. It was formerly called the long-billed marsh wren to distinguish it from the sedge wren, then known as the short-billed marsh wren. Source

Where it is now

In the last 8 weeks this bird was recorded 10,858 times across 51 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 17°C (typically 9 to 23°C, from 24 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.