Cerulean Warbler

Setophaga cerulea

The cerulean warbler is a small songbird in the family Parulidae. It is a long-distance migrant, breeding in eastern North American hardwood forests and wintering on the Eastern slope of the Andes in South America during non-breeding season, preferring subtropical forests. Source

Where it is now

In the last 8 weeks this bird was recorded 12 times across 2 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 19°C (typically 15 to 24°C, from 6 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.