Black-and-white Warbler

Mniotilta varia

The black-and-white warbler is a species of New World warbler, and the only member of its genus, Mniotilta. It breeds in northern and eastern North America and winters in Florida, Central America, and the West Indies down to Peru. It has been recorded as a vagrant in Northern Europe, especially Britain and Ireland. Relative to other New World warblers, it is not well studied. Source

Where it is now

In the last 8 weeks this bird was recorded 32,113 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 17°C (typically 13 to 24°C, from 35 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 18°N in October to 49°N in June, about 3,400 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.