Yellow-crowned Tyrannulet

Tyrannulus elatus

The yellow-crowned tyrannulet is a species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers. It is found in Costa Rica, Panama, and in every mainland South American country except Argentina, Chile, Paraguay, and Uruguay. Source

Where it is now

In the last 8 weeks this bird was recorded 1,390 times across 3 areas (each area is a 5 degree square).

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Movement and weather

Over the weeks it was present in the past year, its centre in South America ranged from 5°S in June to 7°N in September, 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.