Alder Flycatcher

Empidonax alnorum

The alder flycatcher is a small insect-eating bird in the tyrant flycatcher family. The genus name Empidonax is from Ancient Greek empis, "gnat", and anax, "master". The specific alnorum is Latin and means "of the alders". Source

Where it is now

In the last 8 weeks this bird was recorded 2,355 times across 28 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 18°C (typically 14 to 21°C, from 30 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.

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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.