Acadian Flycatcher

Empidonax virescens

The Acadian flycatcher is a small insect-eating bird of the tyrant flycatcher family. Source

Where it is now

In the last 8 weeks this bird was recorded 47,046 times across 25 areas (each area is a 5 degree square).

See the Acadian Flycatcher on the live map

Movement and weather

Each season it is first heard regularly where daytime highs are around 24°C (typically 19 to 25°C, from 17 areas). That holds across 20° of latitude, which suggests its timing follows temperature more than the calendar.

Over the weeks it was present in the past year, its centre in North America ranged from 16°N in October to 37°N in June, about 2,400 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.