Hyla arborea
Silhouette: Luca Leicht · PhyloPic
In 3 days ~30% in a week ~60%
The European tree frog (Hyla arborea) is a small tree frog. As traditionally defined, it was found throughout much of Europe, Asia and northern Africa, but based on molecular genetic and other data several populations formerly included in it are now recognized as separate species (for example, H. intermedia of Italy and nearby, H. molleri of the Iberian Peninsula, H. meridionalis of parts of southwestern Europe and northern Africa, and H. orientalis of parts of Eastern Europe, Turkey and the Black Sea and Caspian Sea regions), limiting the true European tree frog to Europe from France to Poland and Greece.
European tree frogs are small; males range from 32–43 mm (1.3–1.7 in) in length, and females range from 40–50 mm (1.6–2.0 in) in length. They are slender, with long legs. Their dorsal skin is smooth, while their ventral skin is granular. Their dorsal skin can be green, gray, or tan depending on the temperature, humidity, or their mood. Their ventral skin is a whitish color, and the dorsal and ventral skin is separated by a dark brown lateral stripe from the eyes to the groin. Females have white throats, while males have golden brown throats with large (folded) vocal...
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Hortobágy National Park | 🇭🇺 Hungary | |
| 2 | Kiskunság National Park | 🇭🇺 Hungary | |
| 3 | Fertő-Hanság National Park | 🇭🇺 Hungary | |
| 4 | Bavarian Forest National Park | 🇩🇪 Germany | |
| 5 | Oosterschelde National Park | 🇳🇱 Netherlands |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | Skansen | 🇸🇪 Sweden | |
| 2 | Slimbridge Wetland Centre | 🇬🇧 United Kingdom | |
| 3 | Wildpark Schwarze Berge | 🇩🇪 Germany | |
| 4 | Berlin Zoological Garden | 🇩🇪 Germany | |
| 5 | Universeum | 🇸🇪 Sweden | |
| 6 | Freiland-Aquarium und -Terrarium Stein | 🇩🇪 Germany | |
| 7 | Aquarium Berlin | 🇩🇪 Germany | |
| 8 | Fluviário de Mora | 🇵🇹 Portugal | |
| 9 | Baltic Sea Science Center | 🇸🇪 Sweden | |
| 10 | Lake Tisza Ecocentre | 🇭🇺 Hungary | |
| 11 | Löbbecke Museum und Aquazoo | 🇩🇪 Germany |
With luck
About 10% of wildlife watchers report a European Tree Frog sighting in Oosterschelde National Park on a given day, based on 15 verified sightings from GBIF citizen-science data from 2019 to 2026. Over three days the chance rises to about 30%, and over a week to about 60%, if each day is a fresh chance.
August
In that month about 30% of wildlife watchers report a European Tree Frog in Oosterschelde National Park on a given day, against under 5% in June and November–April, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most European Tree Frog sightings with a recorded time, and about 8 in 10 of them come between 6 am and 6 pm: it is a daytime animal.
5th of 5
Of the 5 parks where we can rate European Tree Frog sightings, Oosterschelde National Park ranks 5th at about 10%. The best odds are in Hortobágy National Park (Hungary, about 50%), Kiskunság National Park (Hungary, about 50%) and Fertő-Hanság National Park (Hungary, about 40%).
GBIF citizen-science records
It is estimated from how often the European Tree Frog is recorded against all the amphibians logged in Oosterschelde National Park (15 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.
