Home | Reptiles and Amphibians in the News | World’s First Lung-less Frog Discovered in Borneo

World’s First Lung-less Frog Discovered in Borneo

Indonesia’s Kalimantan jungle toad (aka Bornean flat-headed frog), Barboula kalimantenensis, has been declared the only frog known to lack lungs. The frog itself was not collected and described until 1978. The fact that it is lung-less was released on April 10, 2008, by Dr. David Bickford of the National University of Singapore. The picture listed here is courtesy of Dr. Bickford.

This aquatic frog, known only from the Kapaus River Basin in West Kalimantan, Borneo, relies upon its skin when breathing in its habitat’s cold, highly-oxygenated waters. Its flat shape may increase the surface available for oxygen absorption, but little else is known about its natural history. Since lungs increase buoyancy, their loss may be an adaptation to life in fast-moving waters (the frog might more easily remain stable at the stream’s bottom). Bornean Flat-Headed Frog

Many salamanders (i.e. North America’s red-backed salamander, Plethodon cinereus) and I species of caecilian (legless amphibians) are lung-less. Most frogs, especially aquatic species such as the African clawed frog, Xenopus laevis, a popular pet, use cutaneous respiration on occasion. Others have unusual means of assisting their lungs – the Lake Titicaca frog, Telmatobius culeus, does “push-ups” to increase water flow to its oxygen-absorbing skin folds, and male West African hairy frogs, Trichobatrachus robustus, obtain oxygen via hair-like skin projections.

Logging and mining are degrading water quality in the Kalimantan jungle toad’s streams, and threaten its continued existence.

You can read more about the frogs mentioned here at:



  1. avatar

    Great reading ,Thanks Frank. Alison

About Frank Indiviglio

Read other posts by

Being born with a deep interest in animals might seem unfortunate for a native Bronxite , but my family encouraged my interest and the menagerie that sprung from it. Jobs with pet stores and importers had me caring for a fantastic assortment of reptiles and amphibians. After a detour as a lawyer, I was hired as a Bronx Zoo animal keeper and was soon caring for gharials, goliath frogs, king cobras and everything in-between. Research has taken me in pursuit of anacondas, Orinoco crocodiles and other animals in locales ranging from Venezuela’s llanos to Tortuguero’s beaches. Now, after 20+ years with the Bronx Zoo, I am a consultant for several zoos and museums. I have spent time in Japan, and often exchange ideas with zoologists there. I have written books on salamanders, geckos and other “herps”, discussed reptile-keeping on television and presented papers at conferences. A Master’s Degree in biology has led to teaching opportunities. My work puts me in contact with thousands of hobbyists keeping an array of pets. Without fail, I have learned much from them and hope, dear readers, that you will be generous in sharing your thoughts on this blog and web site. For a complete biography of my experience click here.
Scroll To Top