Duellmanohyla rufioculis
Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~40% in a week ~60%
The rufous-eyed brook frog or rufous-eyed stream frog (Duellmanohyla rufioculis), is a species of frog in the family Hylidae. It is endemic to the mountains of Costa Rica. Its natural habitats are premontane wet forests and rainforests. Tadpoles are found in pools with standing water. Habitat loss is posing some threat to the species, although the overall population is stable.
These frogs grow to 4.1 cm (1.6 in) long; males are smaller than females. Color is extremely variable, ranging from brown to mottled mossy green. A distinct white stripe along the upper lip, flanks, and groin expands beneath the eyes to form a prominent white mark. All specimens have a distinctive red iris with horizontal pupils.
The rufous-eyed brook frog is endemic to the mountainous regions of Costa Rica, and can be found on the Caribbean and Pacific slopes from 700 to 1,600 m (2,310 to 5,250 ft) asl. This species favors humid forests, and lives in foliage alongside streams. Though threatened by habitat destruction and uncommon within its range, the overall population is believed to be stable. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Monteverde Cloud Forest Reserve | 🇨🇷 Costa Rica | |
| 2 | Tenorio Volcano National Park | 🇨🇷 Costa Rica | |
| 3 | Arenal Volcano National Park | 🇨🇷 Costa Rica |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Monteverde Theme Park | 🇨🇷 Costa Rica |
With luck
About 10% of wildlife watchers report a Rufous-eyed brook frog sighting in Arenal Volcano National Park on a given day, based on 34 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 21st most-seen of the 39 amphibians we can rate there. Over three days the chance rises to about 40%, and over a week to about 60%, if each day is a fresh chance.
May and October
In those months about 30% of wildlife watchers report a Rufous-eyed brook frog in Arenal Volcano National Park on a given day, against under 5% in June, the lowest month.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Rufous-eyed brook frog sightings with a recorded time, and about 9 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
3rd of 3
Of the 3 parks where we can rate Rufous-eyed brook frog sightings, Arenal Volcano National Park ranks 3rd at about 10%. The best odds are in Monteverde Cloud Forest Reserve (Costa Rica, about 30%) and Tenorio Volcano National Park (Costa Rica, about 20%).
Same family: Hylidae
The closest relatives of the Rufous-eyed brook frog that you can see in Arenal Volcano National Park (family Hylidae, Hylid Tree Frogs) are Masked Tree Frog (about 50%), Harlequin Treefrog (about 40%) and Mahogany Tree Frog (about 30%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rufous-eyed brook frog is recorded against all the amphibians logged in Arenal Volcano National Park (34 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.
