Hammond's Flycatcher

Empidonax hammondii

Hammond's flycatcher is a flycatcher in the family Tyrannidae. This small insectivorous bird inhabits the coniferous and mixed forests of western North America. The name of this bird commemorates William Alexander Hammond who was the surgeon general of the US Army. Hammond collected bird specimens for Spencer Fullerton Baird. Source

Where it is now

In the last 8 weeks this bird was recorded 6,964 times across 24 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 17°C (typically 7 to 22°C, from 14 areas). That range is wide, so temperature alone does not explain when it turns up.

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.