Swinhoe's White-eye

Zosterops simplex

Swinhoe's white-eye is a bird species in the white-eye family, Zosteropidae. It is found in eastern China, Taiwan, north Vietnam, the Thai-Malay Peninsula, Sumatra and Borneo. Additionally, populations have also been introduced to Southern California, where their population has been expanding rapidly. Source

Where it is now

In the last 8 weeks this bird was recorded 43,260 times across 12 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 Asia ranged from 10°N in June to 27°N in May, about 1,900 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.