Blue-winged Warbler

Vermivora cyanoptera

The blue-winged warbler is a fairly common migratory New World warbler, 11.5 cm (4.5 in) long and weighing 8.5 g (0.30 oz). It breeds in eastern North America in southern Ontario and the eastern United States and winters in southern Central America. Its breeding range is extending northwards, where it is replacing the very closely related golden-winged warbler. Source

Where it is now

In the last 8 weeks this bird was recorded 488 times across 14 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 23°C (typically 17 to 25°C, from 13 areas).

Over the weeks it was present in the past year, its centre in North America ranged from 21°N in October to 42°N in June, about 2,300 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.