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 |
With luck
About 10% of wildlife watchers report an Orange-billed Sparrow sighting in Gandoca-Manzanillo Wildlife Refuge on a given day, based on 79 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 162nd most-seen of the 329 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.
February, May and July–September
In those months about 10% of wildlife watchers report an Orange-billed Sparrow in Gandoca-Manzanillo Wildlife Refuge on a given day, against under 5% in March–April, June and October–January, 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.
17th of 31
Of the 31 parks where we can rate Orange-billed Sparrow sightings, Gandoca-Manzanillo Wildlife Refuge ranks 17th at about 10%. 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 Gandoca-Manzanillo Wildlife Refuge (79 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.
