Philadelphia Vireo

Vireo philadelphicus

The Philadelphia vireo is a small North American songbird in the vireo family (Vireonidae). "Vireo" is a Latin word referring to a green migratory bird, perhaps the female golden oriole, possibly the European greenfinch. The specific philadelphicus is for the city of Philadelphia. Source

Where it is now

In the last 8 weeks this bird was recorded 635 times across 18 areas (each area is a 5 degree square).

See the Philadelphia Vireo on the live map

Movement and weather

Each season it is first heard regularly where daytime highs are around 21°C (typically 17 to 26°C, from 24 areas).

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.

Download every area as CSV

Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.