Calliope Hummingbird

Selasphorus calliope

The calliope hummingbird is the smallest bird native to the United States and Canada. It has a western breeding range mainly from California to British Columbia, and migrates to the Southwestern United States, Mexico, and Central America for its wintering grounds. The calliope hummingbird is the smallest known long-distance bird migrant, completing migrations twice per year of some 9,000 km (5,600 mi). Source

Where it is now

In the last 8 weeks this bird was recorded 351 times across 6 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 20°C (typically 18 to 21°C, from 6 areas). That holds across 20° of latitude, which suggests its timing follows temperature more than the calendar.

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.