Vireo olivaceus
Silhouette: Andy Wilson · PhyloPic
In 3 days ~70% in a week >90%
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 |
Likely
About 40% of wildlife watchers report a Red-eyed Vireo sighting in Congaree National Park on a given day, based on 518 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 24th most-seen of the 148 birds we can rate there. Over three days the chance rises to about 70%, and over a week to over 90%, if each day is a fresh chance.
April and May
In those months about 80% of wildlife watchers report a Red-eyed Vireo in Congaree National Park on a given day, against under 5% in November to February, the lowest months.
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.
10th of 101
Of the 101 parks where we can rate Red-eyed Vireo sightings, Congaree National Park ranks 10th at about 40%. 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.
Same genus: Vireo
The closest relatives of the Red-eyed Vireo that you can see in Congaree National Park (genus Vireo, Vireos) are White-eyed Vireo (about 50%), Yellow-throated Vireo (about 20%) and Blue-headed Vireo (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Red-eyed Vireo is recorded against all the birds logged in Congaree National Park (518 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.
