California Gull

Larus californicus

The California gull is a medium-sized gull, smaller on average than the herring gull, but larger on average than the ring-billed gull. Although named after California, it can be found annually across most of western North America, from the Canadian prairie provinces in the northeast and south through western Mexico. Source

Where it is now

In the last 8 weeks this bird was recorded 296 times across 9 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 5°C (typically 3 to 12°C, from 12 areas).

Over the weeks it was present in the past year, its centre in North America ranged from 30°N in February to 60°N in May, about 3,300 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.