Worm-eating Warbler

Helmitheros vermivorum

The worm-eating warbler is a small New World warbler that breeds in the Eastern United States and migrates to southern Mexico, the Caribbean, and Central America for the winter. It is the only species in the genus Helmitheros. Source

Where it is now

In the last 8 weeks this bird was recorded 4,779 times across 17 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 25°C (typically 17 to 27°C, from 17 areas). That range is wide, so temperature alone does not explain when it turns up.

Over the weeks it was present in the past year, its centre in North America ranged from 15°N in October to 37°N in June, 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.