Yellow Warbler

Setophaga petechia

The mangrove warbler or mangrove yellow warbler is a New World warbler species. It a small bright yellow bird that is found in mangroves on the Atlantic and Pacific coasts of the tropical Americas. It is also present in the Caribbean and on the Galápagos Islands. It was formerly considered to be conspecific with the migratory American yellow warbler. Source

Where it is now

In the last 8 weeks this bird was recorded 13,513 times across 55 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 18°C (typically 15 to 23°C, from 50 areas).

Over the weeks it was present in the past year, its centre in North America ranged from 14°N in January to 53°N in June, about 4,300 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.