Black-throated Green Warbler

Setophaga virens

The black-throated green warbler is a small songbird of the New World warbler family. Source

Where it is now

In the last 8 weeks this bird was recorded 5,138 times across 37 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 16°C (typically 12 to 23°C, from 23 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.