Arremon aurantiirostris
Silhouette: Juan Camilo Cepeda-Duque · PhyloPic
In 3 days ~10% in a week ~30%
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 |
Rare
Under 5% of wildlife watchers report an Orange-billed Sparrow sighting in Marino Ballena National Park on a given day, based on 84 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 134th most-seen of the 303 birds we can rate there. Over three days the chance rises to about 10%, and over a week to about 30%, if each day is a fresh chance.
March–May and September
In those months about 10% of wildlife watchers report an Orange-billed Sparrow in Marino Ballena National Park on a given day, against under 5% in June–August and October–February, 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.
20th of 31
Of the 31 parks where we can rate Orange-billed Sparrow sightings, Marino Ballena National Park ranks 20th at under 5%. The best odds are in Piedras Blancas National Park (Costa Rica, about 40%), 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 Marino Ballena National Park (84 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.
