Blue-black Grassquit

Volatinia jacarina

The blue-black grassquit is a small Neotropical bird in the family Thraupidae, the tanagers and allies. It is found in Mexico, every Central American country, every mainland South American country, in Trinidad and Tobago, and in Grenada. Source

Where it is now

In the last 8 weeks this bird was recorded 23,491 times across 24 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 29 to 30°C, from 8 areas). That holds across 50° 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 South America ranged from 19°S in May to 7°N in September, 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.