Hyalinobatrachium colymbiphyllum
Silhouette: Jose Carlos Arenas-Monroy · PhyloPic
In 3 days ~30% in a week ~60%
Hyalinobatrachium colymbiphyllum, also called the bare-hearted glass frog, plantation glass frog and the cricket glass frog, is a species of frog in the family Centrolenidae that is found in moist forests, often near streams, in countries in Central America and South America. They are small, green frogs with many similarities to other glass frogs, however, they have the most transparent undersides of any glass frogs. Their transparent undersides make them ideal bio-indicators for how global warming and other threats are affecting the animals in the forests.
Bare-hearted glass frogs are similar in features to most glass frogs but have their own distinct characteristics. Like most glass frogs, they are small and green with yellow spots and transparent undersides. The transparent undersides are the main feature of most glass frogs, but the bare-hearted glass frog has the clearest underside, allowing almost full visibility of their internal organs. Their transparent skin also makes them difficult to see, as well as their size. They are very small, with male frogs being 22–27 mm (0.87–1.06 in) long and females 24.5–29 mm (0.96–1.14 in) long. Other distinct characteristics... Wikipedia →
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Costa Rica · 2023
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Panama · 2026
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| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Piedras Blancas National Park | 🇨🇷 Costa Rica |
More parks will be added in future updates.
With luck
About 10% of wildlife watchers report a Plantation Glass Frog sighting in Piedras Blancas National Park on a given day, based on 6 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 31st most-seen of the 33 amphibians we can rate there. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
September
In that month about 30% of wildlife watchers report a Plantation Glass Frog in Piedras Blancas National Park on a given day, against under 5% in February, April–July, October and December, the lowest months.
Between 8 and 11 pm
Across all the parks we cover, that three-hour window holds the most Plantation Glass 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.
Only Piedras Blancas National Park, in our data
Piedras Blancas National Park is the only park on Wallace's Line with enough records to rate Plantation Glass Frog sightings: about 10% of wildlife watchers there report one on a given day.
GBIF citizen-science records
It is estimated from how often the Plantation Glass Frog is recorded against all the amphibians logged in Piedras Blancas National Park (6 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.
