Sulphur-bellied Flycatcher

Myiodynastes luteiventris

The sulphur-bellied flycatcher is a large member of the family Tyrannidae, the tyrant flycatchers. It is regularly found from southern Arizona in the United States south to Bolivia and occurs casually or as a vagrant further north, east, and south of its usual range. Source

Where it is now

In the last 8 weeks this bird was recorded 968 times across 9 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 29°C (typically 28 to 30°C, from 6 areas). That holds across 25° of latitude, which suggests its timing follows temperature more than the calendar.

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.