description Bornean Flat-headed Frog Overview
Cold, fast-flowing rivers in Indonesian Borneo are the habitat of the Bornean flat-headed frog, Barbourula kalimantanensis. This small, fully aquatic amphibian is native to Kalimantan and has a flattened body suited to life in moving water. Its association with clear, oxygen-rich streams makes the condition of those waterways central to its ecology. The low profile also distinguishes it from many frogs that divide their time between land and water.
The species became known for reports that it had no lungs and obtained oxygen entirely through its skin. Later anatomical work identified small lungs, so that earlier description should no longer be treated as established fact. Skin respiration remains relevant to amphibian biology, but this frog is not evidence of complete lunglessness. It is useful for readers interested in aquatic adaptations and how improved observation can revise a widely repeated scientific claim.
help Bornean Flat-headed Frog FAQ
Why is the Bornean flat-headed frog completely unique among amphibians?
The Bornean flat-headed frog (Barbourula kalimantanensis) is the only known species of frog in the world that has completely lost its lungs. It relies entirely on cutaneous respiration, meaning it absorbs oxygen directly through its skin.
How does the Bornean flat-headed frog breathe without lungs?
Because it lacks lungs, this small frog breathes directly through its highly vascularized skin. To make this process efficient, it lives in cold, fast-flowing, highly oxygenated streams in the Kalimantan region of Borneo.
Why does the Bornean flat-headed frog have a flat body shape?
The frog's incredibly flattened head and body increase its overall surface area, which allows for a greater volume of oxygen to be absorbed through its skin. This aerodynamic shape also helps it avoid being swept away by the strong river currents in its habitat.
What is the current conservation status of the Bornean flat-headed frog?
The species is currently classified as Endangered on the IUCN Red List. Its extremely limited range is under severe threat from illegal gold mining, deforestation, and increased sedimentation in its river habitats.
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