Phacellodomus sibilatrix
Silhouette: Sheatherius · PhyloPic
In 3 days <5% in a week ~10%
The little thornbird (Phacellodomus sibilatrix) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Bolivia, Brazil, Paraguay, and Uruguay. The formal description of the little thornbird is credited to Philip Sclater's 1879 publication. However, a specimen collected by Azara and described in 1817 by Vieillot as Sylvia ruficollis was later determined to be a little thornbird. Sclater's binomial was retained in the interest of long usage and continuity.
The little thornbird is monotypic. The little thornbird is 13 to 14 cm (5.1 to 5.5 in) long and weighs about 14 to 16 g (0.49 to 0.56 oz). It is the smallest member of its genus. The sexes have the same plumage. Adults have a wide dull buff-whitish supercilium that extends beyond the eye and an indistinct dull brown stripe behind the eye on an otherwise light brownish face. Their forehead is light rufous with pale streaks, their crown and back dull brown, and their rump and uppertail coverts rufescent-tinged brown. Their wings are mostly shades of brown with darker brown primary coverts and some rufescence. Their tail's central... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | El Impenetrable National Park | 🇦🇷 Argentina | |
| 2 | Iberá National Park | 🇦🇷 Argentina |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Buenos Aires | 🇦🇷 Argentina |
Rare
Under 5% of wildlife watchers report a Little Thornbird sighting in Iberá National Park on a given day, based on 25 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 236th most-seen of the 284 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.
June
In that month about 10% of wildlife watchers report a Little Thornbird in Iberá National Park on a given day, against under 5% in July to May, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Little Thornbird sightings with a recorded time, and about 8 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 Little Thornbird sightings, Iberá National Park ranks 2nd at under 5%. The best odds are in El Impenetrable National Park (Argentina, about 10%).
GBIF citizen-science records
It is estimated from how often the Little Thornbird is recorded against all the birds logged in Iberá National Park (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.
