Arctic Redpoll

Acanthis hornemanni

The redpoll is a species of small passerine bird in the finch family Fringillidae. It is the only species placed in the genus Acanthis. It breeds in the Arctic and north temperate Holarctic tundra and taiga. The redpoll was formerly widely treated as three species: the common or mealy redpoll, the arctic or hoary redpoll, and the lesser redpoll. Source

Where it is now

In the last 8 weeks this bird was recorded 39 times across 9 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 -17 to -15°C, from 5 areas). That holds across 15° of latitude, which suggests its timing follows temperature more than the calendar.

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.