Asthenes pyrrholeuca
Silhouette: Sheatherius · PhyloPic
In 3 days ~70% in a week ~90%
The sharp-billed canastero or lesser canastero (Asthenes pyrrholeuca) is a species of bird in the Furnariinae subfamily of the ovenbird family Furnariidae. It is found in Argentina, Bolivia, Chile, Paraguay, and Uruguay, and has also occurred as a vagrant in Brazil.
The sharp-billed canastero's taxonomy is unsettled. The IOC and HBW consider affinis to be a seasonal morph of sordida and flavogularis to be a seasonal morph of the nominate pyrrholeuca. This article follows the two-subspecies model.
The sharp-billed canastero is 14 to 15 cm (5.5 to 5.9 in) long and weighs 12 to 14 g (0.42 to 0.49 oz). It is one of the smaller canasteros, with a pointed bill that is thinner than those of most others. The sexes have the same plumage. Adults of the nominate subspecies have a gray-brown face with a paler supercilium... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Península Valdés | 🇦🇷 Argentina | |
| 2 | Nahuel Huapi National Park | 🇦🇷 Argentina | |
| 3 | Torres del Paine National Park | 🇨🇱 Chile |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Rosario | 🇦🇷 Argentina | |
| 2 | Cordoba | 🇦🇷 Argentina | |
| 3 | Buenos Aires | 🇦🇷 Argentina | |
| 4 | Asuncion | 🇵🇾 Paraguay |
Possible
About 30% of wildlife watchers report a Sharp-billed Canastero sighting in Península Valdés on a given day, based on 162 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 26th most-seen of the 96 birds we can rate there. Over three days the chance rises to about 70%, and over a week to about 90%, if each day is a fresh chance.
November to January
In those months about 40% of wildlife watchers report a Sharp-billed Canastero in Península Valdés on a given day, against about 10% in April, the lowest month. June and July have too few records to rate.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Sharp-billed Canastero sightings with a recorded time, and about 9 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 3 parks where we can rate Sharp-billed Canastero sightings, Península Valdés has the highest daily chance: about 30%. Next come Nahuel Huapi National Park (Argentina, about 20%) and Torres del Paine National Park (Chile, about 10%).
GBIF citizen-science records
It is estimated from how often the Sharp-billed Canastero is recorded against all the birds logged in Península Valdés (162 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.
