Hermit Warbler

Setophaga occidentalis

The hermit warbler is a small perching bird. It is a species of New World warbler or wood-warbler. They are a migratory bird, the breeding range spanning the majority of the west coast of the United States. Their winter range includes parts of Mexico and Central America as well as parts of the southern California coast. Source

Where it is now

In the last 8 weeks this bird was recorded 130 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 North America ranged from 28°N in March to 42°N in June, about 1,500 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.