White-crested Tyrannulet

Serpophaga subcristata

The white-crested tyrannulet is a small species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, Brazil, Paraguay, and Uruguay. Source

Where it is now

In the last 8 weeks this bird was recorded 6,537 times across 6 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 32°S in September to 21°S in July, about 1,200 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.