Tyrannus vociferans
Silhouette: Andy Wilson · PhyloPic
In 3 days ~30% in a week ~60%
Cassin's kingbird (Tyrannus vociferans) is a large tyrant flycatcher native to western North America. The name of this bird commemorates the American ornithologist John Cassin. Cassin's kingbird was formally described in 1826 by English naturalist William Swainson under the current binomial name Tyrannus vociferans. The type locality is Temascaltepec, Mexico. The specific epithet vociferans is Latin for "shouting".
Two subspecies are recognised: They have a pale throat and deep yellow lower breast. Juveniles are duller and have pale edges on their wings. Measurements: Length: 8.3–9.1 in (21–23 cm) Weight: 1.6 oz (45 g) Wingspan: 41 cm Cassin's kingbird and the western kingbird are similar in appearance. Cassin's is a little larger than the western and the upper parts are a darker gray than the western. The most distinctive difference between these birds is that the Cassin's has a thin white edge... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Reserva de la Biosfera Mariposa Monarca | 🇲🇽 Mexico | |
| 2 | Cabo Pulmo National Park | 🇲🇽 Mexico | |
| 3 | Guadalupe Mountains National Park | 🇺🇸 United States | |
| 4 | Bahía de Loreto National Park | 🇲🇽 Mexico | |
| 5 | Big Bend National Park | 🇺🇸 United States | |
| 6 | Saguaro National Park | 🇺🇸 United States | |
| 7 | Zion National Park | 🇺🇸 United States | |
| 8 | Cumbres de Monterrey National Park | 🇲🇽 Mexico | |
| 9 | El Vizcaíno Biosphere Reserve | 🇲🇽 Mexico | |
| 10 | Channel Islands National Park | 🇺🇸 United States | |
| 11 | Grand Canyon National Park | 🇺🇸 United States | |
| 12 | Cañón del Sumidero National Park | 🇲🇽 Mexico | |
| 13 | Joshua Tree National Park | 🇺🇸 United States | |
| 14 | Point Pelee National Park | 🇨🇦 Canada | |
| 15 | Everglades National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | León | 🇲🇽 México | |
| 2 | Puebla | 🇲🇽 México | |
| 3 | Mexico City | 🇲🇽 México | |
| 4 | Toluca | 🇲🇽 México | |
| 5 | San Diego | 🇺🇸 United States | |
| 6 | Los Angeles | 🇺🇸 United States | |
| 7 | Guadalajara | 🇲🇽 México | |
| 8 | Tijuana | 🇲🇽 México | |
| 9 | Torreón | 🇲🇽 México | |
| 10 | San Luis Potosí | 🇲🇽 México |
With luck
About 10% of wildlife watchers report a Cassin's Kingbird sighting in San Luis Potosí on a given day, based on 8 verified sightings from GBIF citizen-science data. It is the 32nd most-seen of the 62 birds we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
April and May
In those months about 20% of wildlife watchers report a Cassin's Kingbird in San Luis Potosí on a given day, against about 10% in November to February, the lowest months. Those are among San Luis Potosí's driest months, with about 15 mm of rain a month against 110 mm in July. March and June–October have too few records to rate.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Cassin's Kingbird sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
10th of 15
Of the 15 cities where we can rate Cassin's Kingbird sightings, San Luis Potosí ranks 10th at about 10%. The best odds are in León (México, about 80%), Puebla (México, about 50%) and Mexico City (México, about 40%).
Same family: Tyrannidae
The closest relatives of the Cassin's Kingbird that you can see in San Luis Potosí (family Tyrannidae, Tyrant Flycatchers) are Vermilion Flycatcher (about 60%), Black Phoebe (about 20%) and Great Kiskadee (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Cassin's Kingbird is recorded against all the birds logged in San Luis Potosí (8 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.
