Sialia mexicana
Silhouette: Andy Wilson · PhyloPic
In 3 days ~50% in a week ~80%
The western bluebird (Sialia mexicana) is a small North American thrush. The western bluebird was formally described by the English naturalist William Swainson in 1832 and given the binomial name Sialia mexicana. Six subspecies are recognized:
The western bluebird is a small stocky bird with a length of 15 to 18 cm (5.9 to 7.1 in). The adult male is bright blue on top and on the throat with an orange breast and sides, a brownish patch on back, and a gray belly and undertail coverts. The adult female has a duller blue body, wings, and tail, a gray throat, a dull orange breast, and a gray belly and undertail coverts. Both sexes have a thin straight bill with a fairly short tail. Immature birds have duller colors than the adults, and have... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Grand Canyon National Park | 🇺🇸 United States | |
| 2 | Sequoia and Kings Canyon National Parks | 🇺🇸 United States | |
| 3 | Zion National Park | 🇺🇸 United States | |
| 4 | Guadalupe Mountains National Park | 🇺🇸 United States | |
| 5 | Yosemite National Park | 🇺🇸 United States | |
| 6 | Reserva de la Biosfera Mariposa Monarca | 🇲🇽 Mexico | |
| 7 | Death Valley National Park | 🇺🇸 United States | |
| 8 | Redwood National Park | 🇺🇸 United States | |
| 9 | Rocky Mountain National Park | 🇺🇸 United States | |
| 10 | Joshua Tree National Park | 🇺🇸 United States | |
| 11 | Saguaro National Park | 🇺🇸 United States | |
| 12 | Big Bend National Park | 🇺🇸 United States | |
| 13 | Channel Islands National Park | 🇺🇸 United States | |
| 14 | Olympic National Park | 🇺🇸 United States | |
| 15 | Cumbres de Monterrey National Park | 🇲🇽 Mexico |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sacramento | 🇺🇸 United States | |
| 2 | Los Angeles | 🇺🇸 United States | |
| 3 | San Francisco | 🇺🇸 United States | |
| 4 | San Diego | 🇺🇸 United States | |
| 5 | Mesa | 🇺🇸 United States | |
| 6 | Calgary | 🇨🇦 Canada | |
| 7 | Phoenix | 🇺🇸 United States | |
| 8 | Austin | 🇺🇸 United States | |
| 9 | Portland | 🇺🇸 United States | |
| 10 | Las Vegas | 🇺🇸 United States |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Denver Zoo | 🇺🇸 United States |
Possible
About 20% of wildlife watchers report a Western Bluebird sighting in San Francisco on a given day, based on 24,162 verified sightings from GBIF citizen-science data. It is the 37th most-seen of the 375 birds we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
May and June
In those months about 30% of wildlife watchers report a Western Bluebird in San Francisco on a given day, against about 20% in July to April, the lowest months. Those are among San Francisco's driest months, with about 10 mm of rain a month against 110 mm in December.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Western Bluebird sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
3rd of 13
Of the 13 cities where we can rate Western Bluebird sightings, San Francisco ranks 3rd at about 20%. The best odds are in Sacramento (United States, about 40%) and Los Angeles (United States, about 30%).
GBIF citizen-science records
It is estimated from how often the Western Bluebird is recorded against all the birds logged in San Francisco (24,162 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
