Microstilbon burmeisteri
Silhouette: Ferran Sayol · PhyloPic
In 3 days <5% in a week ~10%
The slender-tailed woodstar (Microstilbon burmeisteri) is a species of hummingbird in tribe Mellisugini of subfamily Trochilinae, the "bee hummingbirds". It is the only species placed in the genus Microstilbon. It is found in Argentina and Bolivia.
The slender-tailed woodstar was at one time placed in genus Chaetocercus but was restored to genus Microstilbon by the mid 20th century. The species is the only one in its genus and has no subspecies. The slender-tailed woodstar is 7 to 9 cm (2.8 to 3.5 in) long including its 3 cm (1.2 in) tail. Both sexes have a short, straight, black bill, bronzy green upperparts, and a thin white stripe behind the eye. Males have a reddish purple gorget that flares to the side as "moustache" tufts. The rest of the throat is white, the underparts pale grayish with green mottling on the sides, and the undertail coverts are pale cinnamon. The very narrow forked tail is black. Females have darker cheeks than the male. They do not have the colorful gorget; their underparts are cinnamon-buff. Their central tail feathers are green and the rest cinnamon with a black band near the end. Wikipedia →
Wing sound0:16
Bolivia · 1992
© Sjoerd Mayer · XC1559 · CC BY-NC-SA 3.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Amboró National Park | 🇧🇴 Bolivia |
More parks will be added in future updates.
Rare
Under 5% of wildlife watchers report a Slender-tailed Woodstar sighting in Amboró National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 221st most-seen of the 273 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.
January–February and July
In those months about 10% of wildlife watchers report a Slender-tailed Woodstar in Amboró National Park on a given day, against under 5% in March–May and August–December, the lowest months. June has too few records to rate.
Between 3 and 6 pm
Across all the parks we cover, that three-hour window holds the most Slender-tailed Woodstar sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Only Amboró National Park, in our data
Amboró National Park is the only park on Wallace's Line with enough records to rate Slender-tailed Woodstar sightings: under 5% of wildlife watchers there report one on a given day.
Same family: Trochilidae
The closest relatives of the Slender-tailed Woodstar that you can see in Amboró National Park (family Trochilidae, Hummingbirds) are Fork-tailed Woodnymph (about 30%), White-bellied Hummingbird (about 20%) and Planalto Hermit (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Slender-tailed Woodstar is recorded against all the birds logged in Amboró National Park (7 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.
