Swallow Tanager

Tersina viridis

The swallow tanager is a species of Neotropic bird in the family Thraupidae, the tanagers and allies. It occurs regularly in Panama, on Trinidad, and in every mainland South American country except Chile and Uruguay. It has occurred as a vagrant in those two countries and on Tobago and Bonaire and there are unconfirmed reports from Curaçao. Source

Where it is now

In the last 8 weeks this bird was recorded 37,185 times across 13 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 22°S in November to 4°N in April, about 2,900 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.