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Fleischmann's Glass Frog
Hyalinobatrachium fleischmanni
Silhouette: Jose Carlos Arenas-Monroy · PhyloPic
- KingdomAnimalia (Animals)
- PhylumChordata (Chordates)
- ClassAmphibia (Amphibians)
- OrderAnura (Frogs and Toads)
- FamilyCentrolenidae (Glass Frogs)
- GenusHyalinobatrachium
- SpeciesHyalinobatrachium fleischmanni (Fleischmann's Glass Frog)
In 3 days ~20% in a week ~40%
8 Verified sightings at Arenal Volcano National Park From 2019 to 2026
26 In all 3 parks
November Best month
🌙 Nocturnal When it's spotted
About the Fleischmann's Glass Frog
Hyalinobatrachium fleischmanni, also known as Fleischmann's glass frog or the northern glass frog, is a species of frog in the family Centrolenidae. It is found in the tropical Americas from southern Mexico to Ecuador. Specifically, these frogs occur in Mexico, Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, and Panama, Colombia, and Ecuador. It has often been confused with related species, and the exact distribution depends on the source. This frog tends to have green skin, pale yellowish spots, yellow fingertips and translucent skin covering its stomach.
The specific name fleischmanni honors Carl Fleischmann, a collector in Costa Rica in the 1890s. H. fleischmanni are small and arboreal frogs that lives in lowland and mid-elevation forests of Central and South America. They call during the rainy season.
Glass frogs have similarities to tree frogs. They look very close to the naked eye except glass frog's eyes point forward and are golden. During the day, these frogs camouflage themselves under leaves but above water. Male glass frogs are 19–28 mm long, while females measure from 23–32 mm long. They have a green semi-translucent color... Wikipedia →
Sounds
Advertisement call0:21
Costa Rica · 2014
© Chris Harrison · XC893988 · CC BY-NC-SA 4.0
Recording0:23
Costa Rica · 2023
© Diego Lobo Montoya · iNaturalist · CC BY-NC 4.0
Recording0:11
Costa Rica · 2026
© Jorbin D. Cruz · iNaturalist · CC BY-NC 4.0
Recent sightings of Fleischmann's Glass Frog in Arenal Volcano National Park
LIVEiNaturalistGlobal Distribution
Parks Where Found
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Monteverde Cloud Forest Reserve | 🇨🇷 Costa Rica | |
| 2 | Braulio Carrillo National Park | 🇨🇷 Costa Rica | |
| 3 | Arenal Volcano National Park | 🇨🇷 Costa Rica |
Cities Where Found
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | San José | 🇨🇷 Costa Rica |
Zoos & Centres Where Found
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Toledo Zoo | 🇺🇸 United States | |
| 2 | Nifrel | 🇯🇵 Japan | |
| 3 | Monteverde Theme Park | 🇨🇷 Costa Rica |
Closest Relatives at Arenal Volcano National Park
Before you go
What are the chances of seeing a Fleischmann's Glass Frog in Arenal Volcano National Park?
With luck
About 10% of wildlife watchers report a Fleischmann's Glass Frog sighting in Arenal Volcano National Park on a given day, based on 8 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 33rd most-seen of the 39 amphibians we can rate there. Over three days the chance rises to about 20%, and over a week to about 40%, if each day is a fresh chance.
When is the best time to see a Fleischmann's Glass Frog in Arenal Volcano National Park?
April–May, July and November–December
In those months about 10% of wildlife watchers report a Fleischmann's Glass Frog in Arenal Volcano National Park on a given day, against under 5% in January–March, June and August–October, the lowest months.
What time of day is best to see a Fleischmann's Glass Frog?
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Fleischmann's Glass Frog sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Is Arenal Volcano National Park the best place to see a Fleischmann's Glass Frog?
Among the best
Of the 3 parks where we can rate Fleischmann's Glass Frog sightings, Arenal Volcano National Park ranks 3rd at about 10%, level with the leaders once rounded. The best odds are in Monteverde Cloud Forest Reserve (Costa Rica, about 10%) and Braulio Carrillo National Park (Costa Rica, about 10%).
Where does the Fleischmann's Glass Frog sighting chance come from?
GBIF citizen-science records
It is estimated from how often the Fleischmann's Glass Frog is recorded against all the amphibians logged in Arenal Volcano National Park (8 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.
