Boana rosenbergi
Silhouette: Andy Wilson · PhyloPic
In 3 days ~70% in a week >90%
Rosenberg's treefrog (Hypsiboas rosenbergi), also known as Rosenberg's gladiator frog or Rosenberg's gladiator treefrog, is a species of frog in the family of tree frogs (Hylidae) and genus of gladiator frogs (Boana) found in Costa Rica, Panama, Colombia, Trinidad and Tobago and north-western Ecuador. Its scientific name is a testimony to Mr. W. F. H. Rosenberg who collected the type series, and its common name refers to the aggressiveness of males of the species.
The size of H. rosenbergi varies based on the population that they belong to, with individuals from the Costa Rican population being smaller in size than those from the Panamanian population. In the Panamanian population, males of H. rosenbergi measure on average 83 mm (3.3 in) in snout–vent length and females 86 mm (3.4 in). Females also tend to be heavier than males.
It has partly webbed fingers and entirely webbed toes and large disks on both fingers and toes. Its skin is granulated with small warts, and yellowish, greyish, or reddish in colour, with brown or blackish marbling or spots. It also has dark worm-like markings across the dorsal surfaces of the body and limbs, with gray-white undersurfaces and... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Piedras Blancas National Park | 🇨🇷 Costa Rica | |
| 2 | Manuel Antonio National Park | 🇨🇷 Costa Rica | |
| 3 | Soberanía National Park | 🇵🇦 Panama | |
| 4 | Marino Ballena National Park | 🇨🇷 Costa Rica | |
| 5 | Corcovado National Park | 🇨🇷 Costa Rica | |
| 6 | Machalilla National Park | 🇪🇨 Ecuador | |
| 7 | Carara National Park | 🇨🇷 Costa Rica | |
| 8 | Parque Natural Metropolitano | 🇵🇦 Panama |
Likely
About 40% of wildlife watchers report a Rosenberg's Gladiator Frog sighting in Marino Ballena National Park on a given day, based on 33 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the most-seen of the 12 amphibians we can rate there. Over three days the chance rises to about 70%, and over a week to over 90%, if each day is a fresh chance.
April and June
In those months about 50% of wildlife watchers report a Rosenberg's Gladiator Frog in Marino Ballena National Park on a given day, against under 5% in January, the lowest month.
Between 6 and 9 pm
Across all the parks we cover, that three-hour window holds the most Rosenberg's Gladiator Frog sightings with a recorded time, and about 7 in 10 of them come between 6 pm and 6 am: it is most active around dawn and dusk.
4th of 8
Of the 8 parks where we can rate Rosenberg's Gladiator Frog sightings, Marino Ballena National Park ranks 4th at about 40%. The best odds are in Piedras Blancas National Park (Costa Rica, about 60%), Manuel Antonio National Park (Costa Rica, about 40%) and Soberanía National Park (Panama, about 40%). All parks ranked.
Same family: Hylidae
The closest relatives of the Rosenberg's Gladiator Frog that you can see in Marino Ballena National Park (family Hylidae, Hylid Tree Frogs) are Masked Tree Frog (about 30%) and Milk Frog (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Rosenberg's Gladiator Frog is recorded against all the amphibians logged in Marino Ballena National Park (33 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.
