Vireo vicinior
Silhouette: Caleb Gordon · PhyloPic
In 3 days ~10%
The gray vireo (Vireo vicinior) is a small North American passerine bird in the family Vireonidae, the vireos, greenlets, and shrike-babblers. It is found in the southwestern United States and northern Mexico. The gray vireo was originally described in 1866 as Vireo vicinior, its current binomial.
The gray vireo is monotypic. The gray vireo is about 13 to 15 cm (5.1 to 5.9 in) long and weighs 11.5 to 13.5 g (0.41 to 0.48 oz). The sexes have the same plumage. Adults have a mostly gray crown and face with white lores and a thin white eye-ring. Their upperparts are gray that gains a greenish cast late in the year. Their wings are mostly dark gray to blackish with white tips on the greater coverts that form a wing bar. Their tail is gray with white edges on the outer webs of the outer feathers. Their chin, throat, and upper breast are a paler gray than their upperparts; their belly and undertail coverts are white. They have a dark brown iris, a plumbeous or blackish maxilla, a paler grayish blue mandible, and plumbeous or blue-gray legs and feet.
The gray vireo has a disjunct distribution on both its breeding... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Guadalupe Mountains National Park | 🇺🇸 United States | |
| 2 | Zion National Park | 🇺🇸 United States | |
| 3 | Big Bend National Park | 🇺🇸 United States | |
| 4 | Bahía de Loreto National Park | 🇲🇽 Mexico | |
| 5 | Grand Canyon National Park | 🇺🇸 United States | |
| 6 | Death Valley National Park | 🇺🇸 United States | |
| 7 | Saguaro National Park | 🇺🇸 United States |
Rare
Under 5% of wildlife watchers report a Gray Vireo sighting in Big Bend National Park on a given day, based on 94 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 156th most-seen of the 270 birds we can rate there. Over three days the chance rises to about 10%, if each day is a fresh chance.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Gray Vireo in Big Bend National Park on a given day, so our monthly data shows no clear season.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Gray 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.
3rd of 7
Of the 7 parks where we can rate Gray Vireo sightings, Big Bend National Park ranks 3rd at under 5%. The best odds are in Guadalupe Mountains National Park (United States, about 20%) and Zion National Park (United States, under 5%).
Same genus: Vireo
The closest relatives of the Gray Vireo that you can see in Big Bend National Park (genus Vireo, Vireos) are Bell's Vireo (about 40%), Hutton's Vireo (about 20%) and Plumbeous Vireo (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Gray Vireo is recorded against all the birds logged in Big Bend National Park (94 verified sightings from 2019 to 2026), 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.
