Synallaxis cinerascens
Silhouette: Sheatherius · PhyloPic
In 3 days <5% in a week ~10%
The grey-bellied spinetail (Synallaxis cinerascens) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Brazil, Paraguay, and Uruguay. The grey-bellied spinetail is monotypic. It and the ochre-cheeked spinetail (S. scutata) are sister species.
The grey-bellied spinetail is 13.5 to 15 cm (5.3 to 5.9 in) long and weighs 10 to 14 g (0.35 to 0.49 oz). The sexes have the same plumage. Adults have blackish lores and a faint gray line behind the eye on an otherwise gray-brown face. Their forehead is dark grayish brown, their crown dark brownish olive, and their back, rump, and uppertail coverts are richer brown. Their wings are mostly rich reddish chestnut. Their tail is dark chestnut; the tips of the feathers have no barbs giving a spiny appearance. Their chin is whitish, their upper throat mottled black and pale gray, and their lower throat black. Their underparts are mostly brownish gray with a paler and grayer center to the belly and browner flanks and undertail coverts. Their iris is reddish brown, their bill black (sometimes with a gray base to the mandible), and their legs and... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Itatiaia National Park | 🇧🇷 Brazil | |
| 2 | Iguazú National Park | 🇦🇷 Argentina | |
| 3 | Iguaçu National Park | 🇧🇷 Brazil |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto Alegre | 🇧🇷 Brazil | |
| 2 | Curitiba | 🇧🇷 Brazil |
Rare
Under 5% of wildlife watchers report a Gray-bellied Spinetail sighting in Iguazú National Park on a given day, based on 42 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 262nd most-seen of the 343 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.
Any time of year
In every month with enough records, under 5% of wildlife watchers report a Gray-bellied Spinetail in Iguazú National Park on a given day, so our monthly data shows no clear season.
Between 8 and 11 am
Across all the parks we cover, that three-hour window holds the most Gray-bellied Spinetail sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Among the best
Of the 3 parks where we can rate Gray-bellied Spinetail sightings, Iguazú National Park ranks 2nd at under 5%, level with the leaders once rounded. The best odds are in Itatiaia National Park (Brazil, under 5%).
GBIF citizen-science records
It is estimated from how often the Gray-bellied Spinetail is recorded against all the birds logged in Iguazú National Park (42 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.
