Hylorina sylvatica
Silhouette: Jose Carlos Arenas-Monroy · PhyloPic
In 3 days ~60% in a week ~90%
Hylorina sylvatica (also known as the Emerald forest frog, or in Spanish, sapo arboreo) is a species of frog in the family Batrachylidae. It is monotypic within the genus Hylorina. It is found in Argentina and Chile. This species is endemic to the austral Nothofagus forests of Chile and Argentina with a narrow distribution along the eastern slopes of the Andes.
Male Hylorina sylvatica grow to snout-vent length of 53–56 mm (2.1–2.2 in) and females to 60–66 mm (2.4–2.6 in). They are emerald-green during the day while they turn dark green at night. Adults can be found in permanent and temporary pools, swamps, and marshes.
This species requires wetlands surrounded by vegetation to breed. The female lays eggs in pools and bonds. Larvae are aquatic and found in pools and ponds. Because this species spends a long time as a tadpoles, including overwintering, it requires bodies of water that remain present year round. The tadpoles are light brown in color on top and darker brown underneath. There is a circular mark around the nostrils and a rhomboid mark between the eyes.
While Hylorina sylvatica is uncommon and threatened by habitat... Wikipedia →
Uncertain1:13
Chile · 2025
© Marc Anderson · XC1036754 · CC BY-NC-ND 4.0
Recording0:06
Chile · 2024
© Leonardo Tempesta · iNaturalist · CC BY-NC 4.0
Recording0:13
Chile · 2022
© Waldo L. Moyano · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Vicente Pérez Rosales National Park | 🇨🇱 Chile |
More parks will be added in future updates.
Possible
About 30% of wildlife watchers report an Emerald Forest Frog sighting in Vicente Pérez Rosales National Park on a given day, based on 7 verified sightings from GBIF citizen-science data from 2019 to 2026. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
January and March
In those months about 40% of wildlife watchers report an Emerald Forest Frog in Vicente Pérez Rosales National Park on a given day, against under 5% in October, the lowest month. Those are among Vicente Pérez Rosales National Park's driest months, with about 130 mm of rain a month against 490 mm in June.
Between 10 pm and 1 am
Across all the parks we cover, that three-hour window holds the most Emerald Forest Frog sightings with a recorded time, and about half of them come between 6 am and 6 pm: it is seen both by day and at night.
Only Vicente Pérez Rosales National Park, in our data
Vicente Pérez Rosales National Park is the only park on Wallace's Line with enough records to rate Emerald Forest Frog sightings: about 30% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Emerald Forest Frog is recorded against all the amphibians logged in Vicente Pérez Rosales National Park (7 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.
