Polytmus guainumbi
Silhouette: Ferran Sayol · PhyloPic
In 3 days <5% in a week ~10%
The white-tailed goldenthroat (Polytmus guainumbi) is a species of hummingbird in the subfamily Polytminae, the mangoes. It is found in Argentina, Bolivia, Brazil, Colombia, French Guiana, Guyana, Paraguay, Peru, Suriname, Trinidad and Tobago, and Venezuela.
The white-tailed goldenthroat was at one time named Polytmus thaumantias. The white-tailed goldenthroat is 9.7 to 11.8 cm (3.8 to 4.6 in) long and weighs 4.4 to 5 g (0.16 to 0.18 oz). All subspecies have a long decurved reddish and black bill. The male of the nominate subspecies has shiny golden to bronzy green upperparts. Its tail is long and rounded; the feathers are mostly green with white tips and the outer three pairs have broad white edges. The area around the eye is dusky gray with white streaks above and below it. The underparts are iridescent golden-green. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Caroni Swamp | 🇹🇹 Trinidad and Tobago | |
| 2 | Parque Estadual Encontro das Águas | 🇧🇷 Brazil |
Rare
Under 5% of wildlife watchers report a White-tailed Goldenthroat sighting in Parque Estadual Encontro das Águas on a given day, based on 25 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 226th most-seen of the 308 birds we can rate there. Over three days the chance rises to under 5%, and over a week to about 10%, if each day is a fresh chance.
October
In that month about 10% of wildlife watchers report a White-tailed Goldenthroat in Parque Estadual Encontro das Águas on a given day, against under 5% in May–September and November–December, the lowest months. January to April have too few records to rate.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most White-tailed Goldenthroat sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
2nd of 2
Of the 2 parks where we can rate White-tailed Goldenthroat sightings, Parque Estadual Encontro das Águas ranks 2nd at under 5%. The best odds are in Caroni Swamp (Trinidad and Tobago, about 10%).
Same family: Trochilidae
The closest relatives of the White-tailed Goldenthroat that you can see in Parque Estadual Encontro das Águas (family Trochilidae, Hummingbirds) are Glittering-throated Emerald (about 10%), Gilded Hummingbird (about 10%) and Fork-tailed Woodnymph (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the White-tailed Goldenthroat is recorded against all the birds logged in Parque Estadual Encontro das Águas (25 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.
