Trachycephalus macrotis
Silhouette: Lauren McLean · PhyloPic
In 3 days ~60% in a week ~90%
Trachycephalus macrotis, also known as the Amazonian milk frog and known in Spanish as rana lechera de Pastaza, is a frog in the family Hylidae. It is endemic to Peru and Ecuador. It has been observed between 225 and 925 m above sea level.
The adult male frog measures 69.8 to 91.5 mm in snout-vent length and the adult female frog 93.9 to 118.7 mm. Its head is wider than it is long. It has bronze-colored skin with coffee-colored marks. It has some webbing on its feet and relatively small climbing disks on its toes.
This species was split from the taxon T. typhonius. This nocturnal frog lives in submontane tropical forests, especially primary forest, near streams. However, it has also been spotted near plantations, roads, and human habitation. This frog has been observed between 225 and 925 metres (738 and 3,035 ft) above sea level.
This frog engages in explosive breeding after heavy rain. The male frog floats in a temporary body of water and calls to the female. The eggs float on the water, in which the tadpoles later swim and develop. The IUCN classifies this frog as least concern of extinction because of... Wikipedia →
Recording0:22
Ecuador · 2026
© Alex Bentley · iNaturalist · CC BY-NC 4.0
Recording0:10
Panama · 2020
© Hubert Szczygieł · iNaturalist · CC BY-NC 4.0
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Panama · 2021
© evoecogen · iNaturalist · CC BY-NC 4.0
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Santa Rosa National Park | 🇨🇷 Costa Rica | |
| 2 | Palo Verde National Park | 🇨🇷 Costa Rica | |
| 3 | Las Baulas Marine National Park | 🇨🇷 Costa Rica | |
| 4 | Soberanía National Park | 🇵🇦 Panama | |
| 5 | Ostional Wildlife Refuge | 🇨🇷 Costa Rica | |
| 6 | Manuel Antonio National Park | 🇨🇷 Costa Rica | |
| 7 | Tayrona National Natural Park | 🇨🇴 Colombia | |
| 8 | Cabo Blanco Absolute Nature Reserve | 🇨🇷 Costa Rica | |
| 9 | Piedras Blancas National Park | 🇨🇷 Costa Rica | |
| 10 | Marino Ballena National Park | 🇨🇷 Costa Rica | |
| 11 | Carara National Park | 🇨🇷 Costa Rica | |
| 12 | Parque Natural Metropolitano | 🇵🇦 Panama |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Panama City | 🇵🇦 Panama |
| # | Zoo / Centre | Country | |
|---|---|---|---|
| 1 | El Nispero Zoo | 🇵🇦 Panama | |
| 2 | International Animal Rescue – Costa Rica | 🇨🇷 Costa Rica | |
| 3 | Monteverde Theme Park | 🇨🇷 Costa Rica |
Possible
About 30% of wildlife watchers report a Milk Frog sighting in Soberanía National Park on a given day, based on 91 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 8th most-seen of the 34 amphibians we can rate there. Over three days the chance rises to about 60%, and over a week to about 90%, if each day is a fresh chance.
June to August
In those months about 40% of wildlife watchers report a Milk Frog in Soberanía National Park on a given day, against about 10% in March and November, the lowest months. Those are among Soberanía National Park's wettest months, with about 320 mm of rain a month against 25 mm in February.
Between 7 and 10 pm
Across all the parks we cover, that three-hour window holds the most Milk 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 12
Of the 12 parks where we can rate Milk Frog sightings, Soberanía National Park ranks 4th at about 30%. The best odds are in Santa Rosa National Park (Costa Rica, about 70%), Palo Verde National Park (Costa Rica, about 30%) and Las Baulas Marine National Park (Costa Rica, about 30%). All parks ranked.
Same family: Hylidae
The closest relatives of the Milk Frog that you can see in Soberanía National Park (family Hylidae, Hylid Tree Frogs) are Rosenberg's Gladiator Frog (about 40%), Harlequin Treefrog (about 30%) and Yellow Treefrog (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Milk Frog is recorded against all the amphibians logged in Soberanía National Park (91 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.
