Pacific-slope Flycatcher

Empidonax difficilis

The western flycatcher is a small insectivorous bird in the family Tyrannidae. It is native to western North America, where it breeds in the Rocky Mountains and Pacific Coast forests and mountain ranges from California to Alaska and south to central Mexico; northern populations migrate south to Mexico for the winter. Source

Where it is now

In the last 8 weeks this bird was recorded 21,671 times across 10 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 12 to 19°C, from 13 areas).

Over the weeks it was present in the past year, its centre in North America ranged from 38°N in April to 50°N in July, about 1,300 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.