Yellow-throated Vireo

Vireo flavifrons

The yellow-throated vireo is a small American songbird. Source

Where it is now

In the last 8 weeks this bird was recorded 161,997 times across 34 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 22°C (typically 15 to 26°C, from 23 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 23°N in October to 40°N in July, about 1,900 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.