Green Heron

Butorides virescens

The green heron is a small heron of North and Central America. Butorides is from Middle English butor "bittern" and Ancient Greek -oides, "resembling", and virescens is Latin for "greenish". Source

Where it is now

In the last 8 weeks this bird was recorded 25,515 times across 53 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 23°C (typically 17 to 26°C, from 22 areas).

Over the weeks it was present in the past year, its centre in North America ranged from 14°N in May to 24°N in August, about 1,100 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.