Vireo bellii
Silhouette: Caleb Gordon · PhyloPic
In 3 days ~10% in a week ~20%
Bell's vireo (Vireo bellii) is a songbird that migrates between a breeding range in Western North America and a winter range in Central America. It is dull olive-gray above and whitish below. It has a faint white eye ring and faint wing bars.
This bird was named by Audubon for John Graham Bell, who accompanied him on his trip up the Missouri River in the 1840s. The least Bell's vireo (Vireo bellii pusillus) is an endangered subspecies in Southern California. Consideration of Bell's vireo has been a factor in several land development projects, to protect least Bell's vireo habitat. The decline of the least Bell's vireo is mostly due to a loss of riparian habitat.
Measurements: Length: 4.5–4.9 in (11.5–12.5 cm) Weight: 0.3–0.3 oz (7.4–9.8 g) Wingspan: 6.7–7.5 in (17–19 cm) Least Bell's vireo, V.b. pusillus (southern California) Arizona Bell's vireo, V.b. arizonae (southwestern United States, northern Mexico)
V.b. medius (southwestern Texas, Mexico) V.b. belli (central and midwestern United States to central Mexico) In its breeding range, Bell's vireo often uses dense shrubbery in riparian areas or otherwise near water. Willow... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Big Bend National Park | 🇺🇸 United States | |
| 2 | Saguaro National Park | 🇺🇸 United States | |
| 3 | Death Valley National Park | 🇺🇸 United States | |
| 4 | Cabo Pulmo National Park | 🇲🇽 Mexico | |
| 5 | Badlands National Park | 🇺🇸 United States | |
| 6 | Guadalupe Mountains National Park | 🇺🇸 United States | |
| 7 | Cumbres de Monterrey National Park | 🇲🇽 Mexico | |
| 8 | Bahía de Loreto National Park | 🇲🇽 Mexico | |
| 9 | El Vizcaíno Biosphere Reserve | 🇲🇽 Mexico | |
| 10 | Zion National Park | 🇺🇸 United States | |
| 11 | Point Pelee National Park | 🇨🇦 Canada | |
| 12 | Channel Islands National Park | 🇺🇸 United States | |
| 13 | Grand Canyon National Park | 🇺🇸 United States | |
| 14 | Everglades National Park | 🇺🇸 United States |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Los Angeles | 🇺🇸 United States | |
| 2 | Monterrey | 🇲🇽 México | |
| 3 | San Diego | 🇺🇸 United States | |
| 4 | Mesa | 🇺🇸 United States | |
| 5 | San Antonio | 🇺🇸 United States | |
| 6 | Austin | 🇺🇸 United States | |
| 7 | Dallas | 🇺🇸 United States | |
| 8 | Phoenix | 🇺🇸 United States | |
| 9 | Houston | 🇺🇸 United States | |
| 10 | Mexico City | 🇲🇽 México |
Rare
Under 5% of wildlife watchers report a Bell's Vireo sighting in Monterrey on a given day, based on 39 verified sightings from GBIF citizen-science data. It is the 105th most-seen of the 207 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 20%, if each day is a fresh chance.
September
In that month about 20% of wildlife watchers report a Bell's Vireo in Monterrey on a given day, against under 5% in October to August, the lowest months. That is one of Monterrey's wettest months, with about 200 mm of rain against 20 mm in February.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Bell's Vireo sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 12 cities where we can rate Bell's Vireo sightings, Monterrey ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Los Angeles (United States, under 5%).
GBIF citizen-science records
It is estimated from how often the Bell's Vireo is recorded against all the birds logged in Monterrey (39 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.
