Yellow-green Vireo

Vireo flavoviridis

The yellow-green vireo is a small American passerine bird. It is migratory breeding from Mexico to Panama and wintering in the northern and eastern Andes and the western Amazon Basin. Source

Where it is now

In the last 8 weeks this bird was recorded 1,359 times across 7 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 29°C (typically 28 to 29°C, from 5 areas). That holds across 20° 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.