Yellow-bellied Flycatcher

Empidonax flaviventris

The yellow-bellied 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 8,249 times across 37 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 23°C, from 19 areas). That range is wide, so temperature alone does not explain when it turns up.

Over the weeks it was present in the past year, its centre in North America ranged from 17°N in April to 48°N in June, about 3,400 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.