Selasphorus sasin
Silhouette: Ferran Sayol · PhyloPic
In 3 days ~20% in a week ~40%
Allen's hummingbird (Selasphorus sasin) is a species of hummingbird that breeds in the western United States. It is one of seven species in the genus Selasphorus. Allen's hummingbird is a small bird, with mature adults reaching only 3 to 3.5 in (76 to 89 mm) in length and weighing approximately 2 to 4 grams in weight. They are known for their vibrant colors and energetic behaviors, making them a popular subject for birdwatchers and nature enthusiasts. The male has a green back and forehead, with rust-colored (rufous) flanks, rump, and tail. The male's throat is an iridescent orange-red. The male hummingbirds make use of their elaborate colors to impress the females, which is crucial for mating season. The female and immature Allen's hummingbirds are similarly colored, but lack the iridescent throat patch, instead having a series of speckles on their throats. Females are mostly green, featuring rufous color only on the tail, which also has white tips. Immature Allen's hummingbirds are so similar to the female rufous hummingbird, the two are almost indistinguishable in the field.
The lack of a notch in the second rectrix is considered an important field mark to distinguish... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Channel Islands National Park | 🇺🇸 United States | |
| 2 | Redwood National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Los Angeles | 🇺🇸 United States | |
| 2 | San Diego | 🇺🇸 United States | |
| 3 | Tijuana | 🇲🇽 México | |
| 4 | San Francisco | 🇺🇸 United States | |
| 5 | Philadelphia | 🇺🇸 United States | |
| 6 | Houston | 🇺🇸 United States | |
| 7 | San Antonio | 🇺🇸 United States |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Living Desert Zoo and Gardens | 🇺🇸 United States | |
| 2 | Arizona-Sonora Desert Museum | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report an Allen's Hummingbird sighting in San Francisco on a given day, based on 7,186 verified sightings from GBIF citizen-science data. It is the 108th most-seen of the 375 birds we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
April to June
In those months about 20% of wildlife watchers report an Allen's Hummingbird in San Francisco on a given day, against under 5% in August to January, the lowest months. Those are among San Francisco's driest months, with about 20 mm of rain a month against 110 mm in December.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Allen's Hummingbird sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
4th of 7
Of the 7 cities where we can rate Allen's Hummingbird sightings, San Francisco ranks 4th at about 10%. The best odds are in Los Angeles (United States, about 60%), San Diego (United States, about 50%) and Tijuana (México, about 20%).
GBIF citizen-science records
It is estimated from how often the Allen's Hummingbird is recorded against all the birds logged in San Francisco (7,186 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.
