Vireo olivaceus
Silhouette: Andy Wilson · PhyloPic
In 3 days ~10% in a week ~20%
The red-eyed vireo (Vireo olivaceus) is a small American songbird. It is somewhat warbler-like but not closely related to the New World warblers (Parulidae). Common across its vast range, this species is not considered threatened by the IUCN.
Vireo is a Latin word referring to a green migratory bird, perhaps the female golden oriole, possibly the European greenfinch. The specific olivaceus is Neo-Latin for 'olive-green', from Latin oliva ('olive'). Adults are mainly olive-green on the upper parts with white underparts; they have a red iris and a grey crown edged with black. There is a dark blackish line through the eyes and a wide white stripe just above that line. They have thick blue-grey legs and a stout bill. They are yellowish on the flanks and undertail coverts (though this is faint in some populations).
In the past, the yellow-green vireo (V. flavoviridis), the chivi vireo (V. chivi), and the Noronha vireo (V. gracilirostris) have been considered to be conspecific with the red-eyed vireo; the chivi vireo was split most recently. Other closely related species include the black-whiskered vireo (V. altiloquus) and the Yucatan vireo (V. magister... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Manaus | 🇧🇷 Brazil | |
| 2 | São Luís | 🇧🇷 Brazil | |
| 3 | Montreal | 🇨🇦 Canada | |
| 4 | João Pessoa | 🇧🇷 Brazil | |
| 5 | Bogota | 🇨🇴 Colombia | |
| 6 | Cali | 🇨🇴 Colombia | |
| 7 | Maceió | 🇧🇷 Brazil | |
| 8 | Washington | 🇺🇸 United States | |
| 9 | Edmonton | 🇨🇦 Canada | |
| 10 | Buenos Aires | 🇦🇷 Argentina |
Rare
Under 5% of wildlife watchers report a Red-eyed Vireo sighting in Parque Estadual Encontro das Águas on a given day, based on 45 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 207th most-seen of the 308 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 to November
In those months about 10% of wildlife watchers report a Red-eyed Vireo in Parque Estadual Encontro das Águas on a given day, against under 5% in May–August and December, the lowest months. January to April have too few records to rate.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Red-eyed Vireo sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
74th of 101
Of the 101 parks where we can rate Red-eyed Vireo sightings, Parque Estadual Encontro das Águas ranks 74th at under 5%. The best odds are in Voyageurs National Park (United States, about 60%), Riding Mountain National Park (Canada, about 50%) and Elk Island National Park (Canada, about 50%). All parks ranked.
GBIF citizen-science records
It is estimated from how often the Red-eyed Vireo is recorded against all the birds logged in Parque Estadual Encontro das Águas (45 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.
