Chestnut-backed Chickadee

Poecile rufescens

The chestnut-backed chickadee is a small passerine bird in the tit family, native to western North America. Source

Where it is now

In the last 8 weeks this bird was recorded 7,235,746 times across 22 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 15°C (typically 8 to 21°C, from 7 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.