Cruziohyla sylviae
Silhouette: Dmitry Bogdanov (vectorized by T. Michael Keesey) · PhyloPic
In 3 days ~50% in a week ~80%
Cruziohyla sylviae, also known as Sylvia's tree frog, is a large colourful species of tree frog from Central America. People have seen it between 30 and 1600 meters above sea level. The species was described in 2018 by zoologist Andrew Gray, and is named after his granddaughter. It can be distinguished from the closely related C. calcarifer (Splendid Tree Frog) by having small green lichen-like markings on its dorsal surfaces rather than white or pale blue spots and lacking characteristic dark ventral markings found on the under-thighs of C. calcarifer which are characteristic of only that species of Cruziohyla. The species is also easily identified by having a large external eardrum (tympanum), which is almost the same size as the eye, compared to an eardrum half its size, as seen in C. calcarifer. DNA analysis places C. sylviae genetically closer to its sister species, C. craspedopus, than to the true C. calcarifer described by George A. Boulenger in 1902. The adult male frog measures 44.3 to 67.0 mm in snout-vent length and the adult female frog 73.5 to 88.2 mm.
C. sylviae occurs from Panama to Honduras, where it lives in primary... Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Gandoca-Manzanillo Wildlife Refuge | 🇨🇷 Costa Rica | |
| 2 | Braulio Carrillo National Park | 🇨🇷 Costa Rica | |
| 3 | Cahuita National Park | 🇨🇷 Costa Rica | |
| 4 | Tenorio Volcano National Park | 🇨🇷 Costa Rica | |
| 5 | Soberanía National Park | 🇵🇦 Panama | |
| 6 | Arenal Volcano National Park | 🇨🇷 Costa Rica |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | La Paz Waterfall Gardens | 🇨🇷 Costa Rica | |
| 2 | Monteverde Theme Park | 🇨🇷 Costa Rica |
Possible
About 20% of wildlife watchers report a Sylvia's Tree Frog sighting in Braulio Carrillo National Park on a given day, based on 36 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 18th most-seen of the 46 amphibians we can rate there. Over three days the chance rises to about 50%, and over a week to about 80%, if each day is a fresh chance.
July
In that month about 40% of wildlife watchers report a Sylvia's Tree Frog in Braulio Carrillo National Park on a given day, against under 5% in April and October, the lowest months.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Sylvia's Tree Frog sightings with a recorded time, and about 6 in 10 of them come between 6 pm and 6 am: it is seen both by day and at night.
2nd of 6
Of the 6 parks where we can rate Sylvia's Tree Frog sightings, Braulio Carrillo National Park ranks 2nd at about 20%. The best odds are in Gandoca-Manzanillo Wildlife Refuge (Costa Rica, about 40%).
Same family: Phyllomedusidae
The closest relatives of the Sylvia's Tree Frog that you can see in Braulio Carrillo National Park (family Phyllomedusidae, Leaf Frogs) are Red-eyed Treefrog (about 60%), Parachuting Red-eyed Leaf Frog (about 30%) and Blue-sided Tree Frog (about 10%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Sylvia's Tree Frog is recorded against all the amphibians logged in Braulio Carrillo National Park (36 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.
