Catharus gracilirostris
Silhouette: Sharon Wegner-Larsen · PhyloPic
In 3 days ~90% in a week >90%
The black-billed nightingale-thrush (Catharus gracilirostris) is a species of bird in the family Turdidae, the thrushes and allies. It is found in Costa Rica and Panama. The black-billed nightingale-thrush was originally described in 1865 with its current binomial Catharus gracilirostris.
The black-billed nightingale's further taxonomy is unsettled. The Clements taxonomy recognizes two by including bensoni within accentor. This article follows the three-subspecies model. The black-billed nightingale-thrush is about 15 cm (5.9 in) long and weighs about 20 g (0.71 oz) The sexes have the same plumage. Adults of the nominate subspecies have a slate-gray forecrown, an olive-brown crown, and a slate-gray face. Their upperparts, wings, and the upper side of their tail are olive-brown. Their throat is whitish, the middle of their lower belly light gray to whitish, and the rest of their underparts slate-gray with an olivaceous... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Irazú Volcano National Park | 🇨🇷 Costa Rica | |
| 2 | Los Quetzales National Park | 🇨🇷 Costa Rica | |
| 3 | Tapantí-Macizo de la Muerte National Park | 🇨🇷 Costa Rica | |
| 4 | Volcán Barú National Park | 🇵🇦 Panama | |
| 5 | Poás Volcano National Park | 🇨🇷 Costa Rica | |
| 6 | La Amistad International Park (Panama) | 🇵🇦 Panama | |
| 7 | Chirripó National Park | 🇨🇷 Costa Rica | |
| 8 | Braulio Carrillo National Park | 🇨🇷 Costa Rica |
Likely
About 60% of wildlife watchers report a Black-billed Nightingale-Thrush sighting in Irazú Volcano National Park on a given day, based on 479 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 12th most-seen of the 121 birds we can rate there. Over three days the chance rises to about 90%, and over a week to over 90%, if each day is a fresh chance.
June and October
In those months about 80% of wildlife watchers report a Black-billed Nightingale-Thrush in Irazú Volcano National Park on a given day, against about 30% in January and February, the lowest months.
Between 9 am and noon
Across all the parks we cover, that three-hour window holds the most Black-billed Nightingale-Thrush 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 8 parks where we can rate Black-billed Nightingale-Thrush sightings, Irazú Volcano National Park has the highest daily chance: about 60%. Next come Los Quetzales National Park (Costa Rica, about 50%) and Tapantí-Macizo de la Muerte National Park (Costa Rica, about 40%). All parks ranked.
GBIF citizen-science records
It is estimated from how often the Black-billed Nightingale-Thrush is recorded against all the birds logged in Irazú Volcano National Park (479 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.
