Overview
The Mashpi Glass Frog (Hyalinobatrachium mashpi) is a dazzling amphibian species discovered in 2022 in the hyper-biodiverse Chocó-Andean cloud forests of northwestern Ecuador. Noted for its entirely transparent ventral skin, this delicate frog provides a living anatomical display window, allowing observers to view its beating crimson heart, digestive tract, and liver with the naked eye.
Biology and Physical Characteristics
Measuring barely three-quarters of an inch in length, Hyalinobatrachium mashpi exhibits a light lime-green dorsum sprinkled with minute, pale yellow dots and faint dark reticulations that resemble dappled moss. Its bulbous eyes feature golden-yellow irises with fine black venation. The underbelly (peritoneum) lacks all guanine pigments, rendering the abdomen glass-clear; its pericardium is also transparent, exposing the pulsating red cardiac ventricle and circulatory vessels.
Behavior and Ecology
Mashpi glass frogs are strictly nocturnal and arboreal, spending their adult lives in the leaves of trees and shrubs hanging directly over clean, oxygenated mountain streams. During the rainy season, males perch on the undersides of leaves and emit high-pitched, whistle-like breeding vocalizations to attract females. After mating, the female deposits a clutch of gelatinous eggs on the leaf underside; the male remains steadfastly alongside the clutch for days, defending the embryos from predatory wasps and hydrating them with water stored in his bladder until tadpoles hatch and drop into the rushing torrent below.
Conservation and Human Impact
Evaluated as Endangered due to an extremely localized range spanning under 50 square kilometers, Hyalinobatrachium mashpi is exceptionally vulnerable to habitat loss and water quality degradation. The Chocó-Andean bioregion faces relentless deforestation from timber extraction, small-scale farming, road infrastructure, and open-pit mining concessions. Because glass frog larvae require crystal-clear, unpolluted water to develop, mining runoff and agricultural siltation pose existential extinction threats.
Interesting Factoid
The Mashpi glass frog has completely transparent belly skin and a transparent heart sac, meaning you can literally watch its red heart beat and see food digesting inside its stomach while it rests quietly on a leaf!
Last updated: October 2026