Brown-crested Flycatcher

Myiarchus tyrannulus

The brown-crested flycatcher is a passerine bird in the tyrant flycatcher family Tyrannidae. It is found from the southwestern United States south through Mexico and Central America to Costa Rica; on Aruba, Bonaire, Curaçao, Trinidad, and Tobago; and in every mainland South American country except Chile and possibly Ecuador. Source

Where it is now

In the last 8 weeks this bird was recorded 1,844 times across 19 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 27 to 30°C, from 7 areas). That holds across 60° of latitude, which suggests its timing follows temperature more than the calendar.

Over the weeks it was present in the past year, its centre in North America ranged from 13°N in September to 29°N in July, about 1,800 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.