Global Search for 'lost' frogs yields few findings, important warnings


Concerns Raised about Species' Future as Unprecedented Search for Threatened Amphibians Finds 15 'Missing' Species — including new Rediscoveries in India & Ecuador — but Falls Short Locating Many More


Arlington, VA — A glimmer of hope, but much cause for concern. Those are the reactions from teams of scientists from around the world that have returned from an unprecedented search for 100 species of "lost" amphibians — frogs, salamanders, and caecilians  that have not been seen in a decade or longer, and may now be extinct. 


The Search for Lost Frogs, launched in August by Conservation International (CI) and the IUCN Amphibian Specialist Group (ASG), with support from Global Wildlife Conservation (GWC), sought to document the survival status and whereabouts of threatened species of amphibians which they had hoped were holding on in a few remote places.

However, five months of multiple, targeted expeditions have led to disappointing findings that conservationists say should sound an urgent wake-up call for countries, and prompt coordinated efforts to prevent further declines in the populations of these environmentally sensitive barometer-species. Only four of 100 missing amphibians that scientists set out to find were located. Eleven more rediscoveries were unexpected surprises.

The search — a first of its kind — took place between August and December 2010 in 21 countries, on five continents, and involved 126 researchers. (See list of countries below). It represented a pioneering effort to coordinate and track such a large number of "lost" amphibians. The goal was to establish whether populations have survived increasing pressures such as habitat loss, climate change, and disease, and to help scientists better understand what is behind the amphibian crisis. Amphibians are the most threatened group of vertebrates, with over 30 per cent threatened with extinction due to habitat loss and a fungus that causes chytridomycosis — an infectious disease — among others.

Out of an initial list of 100 "lost" species, only four amphibians were rediscovered during the 2010 global search. Three of these were previously been reported by Conservation International


Cave splayfoot salamander
Chiropterotriton mosaueri
Mexico, Last seen 1941
Omaniundu Reed Frog
Hyperolius sankuruensis
Democratic Republic of Congo, Last seen 1979
Mount Nimba Reed Frog
Hyperolius nimbae
Ivory Coast, Last seen 1967


One new and exciting rediscovery, however, is the Critically Endangered Rio Pescado stubfoot toad of Ecuador (Atelopus balios), which was found this past October. The team of scientists led by the Ecuadorian herpetologist Santiago Ron spoke with members of the local community, who gave convincing accounts of recent sightings of the species — it is often the case that local people know of the existence of species even if scientists do not.

Rio Pescado stubfoot toad
Atelopus balios
Last seen 1995.



A single healthy adult toad was then found during a night search beside a river in an area dominated by farms and tropical rainforest. The striking, spotted toad was the only species identified in the campaign's "top 10" list to be found.

The Rio Pescado stubfoot toad is found only in Ecuador and is restricted to a very small area — four localities in the Pacific lowlands of southwestern Ecuador. The land where it was found is unprotected and the future of this species is uncertain. It is likely that this represents the last population of the species because it has not turned up in any other known localities.
Stubfoot toads — or harlequin toads as they are sometimes referred — have been particularly hard hit by amphibian declines and extinctions, with only a handful of species clinging to survival.  Researchers feared that the chytrid fungus had wiped out the Rio Pescado stubfoot toad, which was previously last seen in 1995, along with many other closely related species in Ecuador. Its rediscovery is significant and encouraging, said CI's amphibian expert Dr. Robin Moore, and should offer Ecuadorians a unique opportunity to protect this gorgeous and rare species.

Other rediscoveries were made in India, where scientists, who were inspired by CI's global search, launched their own campaign to focus on rediscovering local species. The effort resulted in five missing amphibians being rediscovered, so far, including one that was last seen in 1874 and another which was found by pure chance in a rubbish bin.

FOUND: Lost! Amphibians of India
 Dehradun Stream Frog
Amolops chakrataensis
Previously known only from the description of a single individual in 1985. Redisovered this year after 25 years by a team of graduate students from Delhi University: Sonali G, Gargi S and Pratyush with Robin Suyesh, Rachunliu G Kamei and SD Biju.
Elegant Tropical Frog
Micrixalus elegans
Last seen 1937. Rediscovered by KV Gururaja, KP Dinesh and SD Biju.
Chalazodes Bubble-nest Frog
Raorchestes chalazodes
Last seen 1874. It is thought that the species does not have a free-swimming tadpole stage, but completes development inside the egg. Rediscovered by Ganesan R, Seshadri KS and SD Biju.
Anamalai Dot-frog
Ramanella anamalaiensis
Last seen 1938. Rediscovered by SP Vijayakumar, Anil Zachariah, David Raju, Sachin Rai and SD Biju.
Silent Valley Tropical Frog
Micrixalus thampii
Last seen in 1980, this individual was rediscovered in a rubbish bin at a field station in Silent Valley by Don Church, Robin Moore, Franky Bossuyt, Ines Van Bocxlaer, David Gower, Mark Wilkinson, Darrel Frost, Wes Sechrest and SD Biju.
WEBSITE: Lost Amphibians of India

Dr. SD Biju, of the University of Delhi, organized the "Lost! Amphibians of India" to track approximately 50 missing species, and described his reaction to the incredible rediscoveries:

"I was so excited to see the Chalazodes Bubble Nest Frog in life after 136 years. I have never seen a frog with such brilliant colors in my 25 years of research! It has an unusual combination of fluorescent green dorsum, ash blue thighs and patchy yellow eyes. I feel assured that these rediscoveries will infuse more enthusiasm in our pursuit of the remaining 45 'lost' amphibians. Our hunt has just begun and it is a good start."

In Haiti, searches in the country's diminishing forest regions of the southeast and southwest yielded six surprising rediscoveries of species (previously reported by CI) that were not on scientists' initial list of 100, but that had not been seen in two decades – including the Ventriloquial Frog and Mozart's Frog.

In Colombia, no species were rediscovered, but three potentially brand new species to science were documented.


BLOG POST: Lost Frogs Update: Three New Species Discovered in Colombia
 New species of rocket frog – genus Silverstoneia. Living in and around streams, the rocket frogs carefully carry newly hatched tadpoles on their backs to deposit them in water to complete their development.
New species of beaked toad – genus Rhinella. Found in the rainforests of Chocó department of Colombia. In addition to its strange appearance, the beaked toad is rather unusual in that it probably skips the tadpole stage, laying eggs on the forest floor that hatch directly into toadlets.
New toad species – genus undetermined. This highly unusual species has scientists baffled: they know nothing about this species other than where it lives, which is around 2,000m elevation in the Chocó montane rainforest.

Dr. Moore added, "Rediscoveries provide reason for hope for these species, but the flip side of the coin is that the vast majority of species that teams were looking for were not found. This is a reminder that we are in the midst of what is being called the Sixth Great Extinction with species disappearing at 100 to 1000 times the historic rate — and amphibians are really at the forefront of this extinction wave. We need to turn these discoveries and rediscoveries into an opportunity to stem the crisis by focusing on protecting one of the most vulnerable groups of animals and their critical habitats."

To that point, Dr. Moore noted that his teams did not find the #1 species on their "top 10" list:  the emblematic golden toad from Costa Rica, which some consider to be the poster child for the global amphibian extinction crisis. The last specimen, a solitary male, was seen in 1989.

Dr. Moore said: "I'm not completely surprised that it was not found, but I'm pretty disappointed. While it does not confirm that the species is extinct, with every unsuccessful search it does become more likely. It is very sad to lose unique species such as this — I feel like the world becomes a little bit less colorful with every one that is lost."

Amphibians provide many important services to humans such as controlling insects that spread disease and damage crops and helping to maintain healthy freshwater systems. The chemicals in amphibian skins have also been important in helping to create new drugs with the potential to save lives, including a painkiller 200 times more potent than morphine. Not to mention their incalculable role in human cultures, from classical literature to fairy tales, and the aesthetic worth of their bright colors and melodic calls.

Even though the "Search for the Lost Frogs" campaign is coming to an end, CI and ASG will continue their efforts to prevent further extinctions of amphibians and ensure that their habitats remain intact and continue to provide benefits to people, thanks to the support from Andrew Sabin and the Sabin Family Foundation, George Meyer and Maria Semple, the John D. and Catherine T. MacArthur Foundation, Save our Species Fund, the U.S. Fish and Wildlife Service and Global Wildlife Conservation.

"Searching for lost species is among the most important conservation activities we can do as scientists. If we're going to save them, we first have to find them," said Dr. Don Church, Global Wildlife Conservation's President.

Besides the campaign in India, searches for "lost" amphibians will continue in Colombia and Dr. Moore will spearhead a project over the next three years to adopt amphibians as an indicator group to monitor climate change impacts on ecosystem health and incorporate findings into protected area management. The work — to be implemented with several local partners — will take place in Papua New Guinea, Solomon Islands, Haiti and Madagascar.



Search for the Lost Frogs" - Campaign Facts & Figures

  • From August 2010 to December 2010
  • 126 researchers
  • 5 Continents
  • 21 Countries:
    • Australia
    • Brazil
    • Cameroon
    • Chile
    • Colombia
    • Costa Rica
    • DRC
    • Ecuador
    • Guatemala
    • Haiti
    • India
    • Indonesia
    • Ivory Coast
    • Liberia
    • Malaysia
    • Mexico
    • Rwanda
    • South Africa
    • Togo
    • Venezuela
    • Zimbabwe



    The Top 10 "Lost" Amphibian Species

    1. Golden toad (Incilius periglenes) Costa Rica - last seen in 1989
    2. Gastric brooding frog (Rheobatrachus vitellinus and R. silus) Australia - last seen in 1985
    3. Mesopotamia Beaked Toad (Rhinella rostrata) Colombia - last seen in 1914
    4. Jackson's climbing salamander (Bolitoglossa jacksoni) Guatemala - last seen in 1975
    5. African Painted Frog (Callixalus pictus) Dem. Republic of Congo/Rwanda - last seen in 1950
    6. Rio Pescado Stubfoot Toad (Atelopus balios) Ecuador - Rediscovered!
    7. Turkestanian salamander (Hynobius turkestanicus) Kyrgyzstan/Tajikistan/Uzbekistan - last seen in 1909
    8. Scarlet frog (Atelopus sorianoi) Venezuela - last seen in 1990
    9. Hula painted frog (Discoglossus nigriventer) Israel - last seen in 1955
    10. Sambas Stream Toad (Ansonia latidisca) Borneo - last seen in the 1950s


    Global Search Summary - Rediscovered Species From "Top 100"

    Four species were rediscovered from the initial list of 100 (the first three were announced in September 2010). Ecuador's Rio Pescado stubfoot toad (being announced today) is the only among the "top 10" list:


    • MEXICO: Cave Splayfoot Salamander (Chiropterotriton mosaueri) – last seen in 1941
    • IVORY COAST: Mount Nimba Reed Frog (Hyperolius nimbae) - last seen in 1967
    • DEM. REPUBLIC OF CONGO: Omaniundu Reed Frog (Hyperolius sankuruensis) - last seen in 1979
    • ECUADOR: Rio Pescado stubfoot toad (Atelopus balios) Ecuador - last seen in April 1995.



    Additional Surprises & Rediscoveries


    India — Five species were rediscovered in India as part of the "Lost! Amphibians of India" campaign coordinated by the University of Delhi, Global Wildlife Conservation, Natural History Museum,  A V College , ASG and CI. The campaign is expected to continue through the end of the year. (The five species rediscoveries are being announced today for the first time). More at:

    • Chalazodes Bubble-nest Frog (Raorchestes chalazodes) Last seen in 1874! Rediscovered after 136 years. This striking fluorescent green frog with ash-blue thighs and black pupils with golden patches (highly unusual traits among amphibians) frog leads a secretive life, presumably inside reeds during the day. It is thought that the species does not have a free-swimming tadpole stage, but completes development inside the egg. Rediscovered by Ganesan R, Seshadri KS and SD Biju. Listed by the IUCN as Critically Endangered.

    • Anamalai Dot-frog (Ramanella anamalaiensis) Rediscovered after 73 years. This narrow-mouthed frog is named after the Anamalai Hills in the southern Western Ghats where it was discovered (and last seen) in 1937 and the appearance of yellow spots on its upper side and scattered white spots on its underside. The original specimen was lost and there was no confirmed information on the species until its rediscovery by SP Vijayakumar, Anil Zachariah, David Raju, Sachin Rai and SD Biju. The frog calls loudly from marshy areas during the monsoon season but hides the rest of the year under stones and logs on the forest floor or in tree holes. Listed by the IUCN as Data Deficient.

    • Dehradun Stream Frog (Amolops chakrataensis) – only known from the original description of a single specimen in 1985. Redisovered this year after 25 years by a team of graduate students from Delhi University: Sonali G, Gargi S and Pratyush with  Robin Suyesh, Rachunliu G Kamei and SD Biju. The frog is characterized by a light green dorsal color with tiny dark spots. The frog appears to be rare and its habitat requires protection to ensure its survival. Listed by the IUCN as Data Deficient.

    • Silent Valley Tropical Frog (Micrixalus thampii) Last seen 30 years ago and rediscovered in rubbish bin in a field station in Silent Vallery on a fieldtrip following the launch of the LAI campaign in Delhi. The team further observed several more individuals adjacent to a streambed under leaf litter, in closed forest cover within the Kunthi River watershed.  Rediscovered by Don Church, Robin Moore, Franky Bossuyt, Ines Van Bocxlaer, David Gower, Mark Wilkinson, Darrel Frost, Wes Sechrest and SD Biju. Listed by the IUCN as Data Deficient.

    • Elegant Tropical Frog (Micrixalus elegans) Known only from the original description based on a collection in 1937. The original specimen was subsequently lost and the species evaded detection until it was rediscovered after 73 years by KV Gururaja, KP Dinesh and SD Biju in a forest stream-bed at the original collection area. The frog lives in forest streams and calls from the edge of rivers where it presumably breeds. The area is a hotspot for amphibian diversity, containing another 20 species. Currently there is a hydroelectric project proposal in the area and the site is urgently in need of protection. Listed by the IUCN as Data Deficient.

    Haiti — Six "lost" species surprisingly rediscovered in Haiti (announced in January 2011). These were not on the initial list of 100, but were found during the search for another lost species. They had not been seen in close to two decades.

    • Hispaniolan Ventriloquial Frog (Eleutherodactylus dolomedes) – last seen in 1991
    • Mozart's Frog (E. amadeus) – last seen in 1991
    • La Hotte Glanded Frog (E. glandulifer) – last seen in 1991
    • Macaya Breast-spot frog (E. thorectes) - last seen in 1991
    • Hispaniolan Crowned Frog (E. corona) – last seen in 1991
    • Macaya Burrowing Frog (E. parapelates) - last seen in 1996

    Colombia — Three potentially NEW species were found in Colombia (announced in November 2010).

    • New species of beaked toad – genus Rhinella
    • New toad species – genus undetermined
    • New species of rocket frog – genus Silverstoneia


    Available Content For Media (***Please Provide Image Credits***)


    Photos of the species rediscoveries being announced today (Ecuador and India) are available for download:

    Photos of the entire campaign are available for download:

    Video clips of the frog rediscovery in Ecuador and b-roll are available for download:

    Learn more at:

    PERMITTED USE: These images may be downloaded at no charge for one-time use for coverage/promotion of the Lost Frogs/Amphibian Campaign and exclusively in conjunction thereof. No copying, distribution or archiving permitted. No sublicensing, sale or resale permitted.

    REQUIRED CREDIT AND CAPTION: All image uses must bear the copyright notice and be properly credited to the relevant photographer, as shown in this metadata, and must be accompanied by a caption, which makes reference to the Lost Frogs/Amphibian Campaign. Any uses in which the image appears without proper copyright notice, photographer credit and a caption referencing the Lost Frogs/Amphibian Campaign are subject to paid licensing.

    For more information, contact:

    Patricia Malentaqui, International Media Manager, Conservation International
    Office +1 703 341-2471 / mobile +1 571 225-8345 /

    Kim McCabe, Media Director, Conservation International
    Office +1 703 341-2546 / mobile +1 202 203-9927 /

    Professor SD Biju, Dept of Environmental Biology, Systematics lab, University of Delhi, India
    Office: +91 11 27662365 / mobile: +91 9871933622 /

    Note to editors:

    Conservation International (CI) — Building upon a strong foundation of science, partnership and field demonstration, CI empowers societies to responsibly and sustainably care for nature for the well-being of humanity. With headquarters in Washington, DC, CI works in more than 40 countries on four continents. For more information, visit

    IUCN Amphibian Specialist Group (ASG) — The ASG of the International Union for the Conservation of Nature (IUCN) strives to conserve biological diversity by stimulating, developing, and executing practical programs to conserve amphibians and their habitats around the world. This is achieved by supporting a global web of partners to develop funding, capacity and technology transfer to achieve shared, strategic amphibian conservation goals. For more information, visit:

    Global Wildlife Conservation (GWC) — GWC supports life on Earth by advancing both academic and applied approaches to conservation research, action, and education. Along with its strategic worldwide partners, GWC is pursuing a common goal: to save wildlife species from extinction and better understand and maintain the natural world and its biological diversity. For more information, visit:

    The University of Delhi is a premier University of India and is known for its high standards in teaching and research. The Vice President of India is the University's Chancellor. DU is a Central University established in 1922 For more information, visit: The Systematics Lab is a unit of the Department of Environmental Biology and contributes to conservation of amphibians through discovery and documentation of species. For more information, visit: