Red Crossbill

Loxia curvirostra

The red crossbill or common crossbill is a small passerine bird in the finch family Fringillidae. Crossbills have distinctive mandibles, crossed at the tips, which enable them to extract seeds from conifer cones and other fruits. Source

Where it is now

In the last 8 weeks this bird was recorded 165,234 times across 91 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 24°C (typically 18 to 30°C, from 32 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 43°N in December to 53°N in January, about 1,100 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.