Eurasian Blue Tit

Cyanistes caeruleus

The Eurasian blue tit is a small passerine bird in the tit family, Paridae. It is easily recognised by its blue and yellow plumage and small size. Source

Where it is now

In the last 8 weeks this bird was recorded 4,281,869 times across 57 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 14 to 26°C, from 21 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.