Arremon aurantiirostris
Silhouette: Juan Camilo Cepeda-Duque · PhyloPic
In 3 days ~80% in a week >90%
The orange-billed sparrow (Arremon aurantiirostris) is a species of bird in the family Passerellidae, the New World sparrows. It is found from Mexico to Peru. The orange-billed sparrow was formally described in 1847 with its current binomial Arremon aurantiirostris.
The orange-billed sparrow has these eight subspecies: The orange-billed sparrow is 14.5 to 16.5 cm (5.7 to 6.5 in) long and weighs about 35 g (1.2 oz). The sexes have the same plumage and all subspecies have the eponymous bright orange bill. Adults of the nominate subspecies A. a. aurantiirostris have a black crown with a gray stripe along its middle and a wide white supercilium on an otherwise black face. Their upperparts are olive-green and their wings and tail a darker olive-green with yellow at the bend of the wing. Their chin has a small black area and their throat is white with a wide black band below it across the upper upper breast. Their flanks and undertail coverts are brownish gray to olive-green and the rest of their underparts grayish white. They have a very dark brown iris and light brown legs and feet. Juveniles have sooty olive upperparts and breast with a... Wikipedia →
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San José | 🇨🇷 Costa Rica |
Likely
About 40% of wildlife watchers report an Orange-billed Sparrow sighting in Piedras Blancas National Park on a given day, based on 1,060 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 25th most-seen of the 344 birds we can rate there. Over three days the chance rises to about 80%, and over a week to over 90%, if each day is a fresh chance.
March–May and July
In those months about 50% of wildlife watchers report an Orange-billed Sparrow in Piedras Blancas National Park on a given day, against about 30% in February, September and November–December, the lowest months.
Between 7 and 10 am
Across all the parks we cover, that three-hour window holds the most Orange-billed Sparrow 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 31 parks where we can rate Orange-billed Sparrow sightings, Piedras Blancas National Park has the highest daily chance: about 40%. Next come Carara National Park (Costa Rica, about 40%) and Corcovado National Park (Costa Rica, about 30%). All parks ranked.
GBIF citizen-science records
It is estimated from how often the Orange-billed Sparrow is recorded against all the birds logged in Piedras Blancas National Park (1,060 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.
