Cassin's Kingbird

Tyrannus vociferans

Cassin's kingbird is a large tyrant flycatcher native to western North America. The name of this bird commemorates the American ornithologist John Cassin. Source

Where it is now

In the last 8 weeks this bird was recorded 48,218 times across 12 areas (each area is a 5 degree square).

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Movement and weather

Over the weeks it was present in the past year, its centre in North America ranged from 22°N in March to 34°N in June, about 1,300 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.