Blue Grosbeak

Passerina caerulea

The blue grosbeak is a medium-sized North American passerine bird in the cardinal family Cardinalidae. It is mainly migratory, wintering in Central America and breeding in northern Mexico and the southern United States. The male is blue with two brown wing bars. The female is mainly brown with scattered blue feathers on the upperparts and two brown wing bars. Source

Where it is now

In the last 8 weeks this bird was recorded 20,264 times across 36 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 26°C (typically 17 to 27°C, from 26 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 22°N in March to 36°N in June, about 1,500 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.