May 31

Lemur leaf frog (Hylomantis lemur)

Species: Lemur leaf frog (Hylomantis lemur)

Status: Critically Endangered (CR)

Interesting Fact: The lemur leaf frog has the remarkable ability to change colour depending on whether it is active or resting.

More information: The lemur leaf frog is a tiny, highly threatened amphibian from Central America. This species is primarily nocturnal, and spends the day well hidden on leaves. During the day, this frog is a vibrant leaf-green colour, changing to red-brown when it is active. At night, the lemur leaf frog walks stealthily among low vegetation in search of its invertebrate prey. This species breeds during the rainy season, and the female lays between 15 and 30 eggs on leaves that hang over water. After the eggs have hatched, the larvae are washed into the watercourse during heavy rain. This Critically Endangered amphibian is currently found in Costa Rica and Panama, and marginally in Colombia. In Costa Rica this frog is only known from three sites.

The lemur leaf frog has undergone a drastic population decline, estimated to be more than 80 percent loss over a 10 year period. While pigments in the skin of the lemur leaf frog are thought to grant it some resistance, the decline of this species is thought to be due to chytridiomycosis, a disease that is responsible for global amphibian population crashes.  This frog is also threatened by deforestation, especially in Costa Rica.

In Panama, this species is known to exist within at least six protected areas, whereas the habitats of the Costa Rican populations remain unprotected. A captive breeding programme began in 2001 at the Atlanta Botanical Garden, which has been highly successful and has since transferred individuals to other zoos to continue the effort. Other breeding programmes exist at the El Valle Amphibian Conservation Center in Panama, and the Manchester Museum in the United Kingdom.

Find out more about the lemur leaf frog and other species of South America

See images of the lemur leaf frog on ARKive

Find out more about amphibian conservation

Ben Hogan, Wildscreen ARKive PIPS Intern

Apr 4

Angel’s Madagascar frog (Boehmantis microtympanum)

Species: Angel’s Madagascar frog (Boehmantis microtympanum)

Status: Endangered (EN)

Interesting Fact: Angel’s Madagascar frog is not known to produce any vocalisations and its external ear drum is much smaller than in most frog species.

More information: Angel’s Madagascar frog is a large-bodied frog species that has a marbled green-brown or grey pattern on the upper surface of its body, perfectly camouflaging it against the abundant moss-covered rocks in its habitat.

The impressive yet infrequent energetic movements of this species are only used when an individual is disturbed, and Angel’s Madagascar frog is relatively sedentary for the majority of the time. The main prey items of this species include insects, small freshwater crustaceans and smaller frogs, which it hunts for at dusk and generally devours whole. This long-living amphibian can live for up to seven years.

Local extinctions of Angel’s Madagascar frog have already occurred due to the extensive destruction of forest habitats throughout its range, especially in southeast Madagascar. As well as habitat loss and degradation, the introduction of an invasive eucalyptus species has also led to population declines in this species.

The range of Angel’s Madagascar frog includes two protected areas, the Andohela and Midongy-du-Sud National Parks, although further protection of this species’ habitat would be highly beneficial for its conservation. Promoting sustainable forestry practices within the local community would also help to mitigate the extensive habitat destruction that continues to remove huge expanses of naturally occurring forest across Madagascar.

Find out more about amphibians on the IUCN Red List

Find out more about conservation in Madagascar

See images of Angel’s Madagascar frog on ARKive

Hannah Mulvany, ARKive Content and Outreach Officer

Dec 17

The Amphibian Survival Alliance (ASA), Rainforest Trust, Global Wildlife Conservation and the Andrew Sabin Family Foundation have committed one million dollars to protect vital frog habitats around the world in the coming year.

Current figures from the International Union for the Conservation of Nature (IUCN) estimate that around 30.2% of amphibian species are currently under threat of extinction, with 12.5% of birds and 20.6% of mammals also at risk. These statistics show that amphibians are by far the most threatened group of species and its members are in dire need of conservation efforts to secure their future survival. Amphibians are at the forefront of what is being described as the ‘sixth mass extinction event on earth’, with 120 species disappearing in recent years and around 7,000 amphibian species in decline.

Southern gastric-brooding frog image

The southern gastric-brooding frog is thought to have gone extinct in 1981

Sensitive souls

The class Amphibia contains frogs, salamanders, caecilians and toads, among many others. As a group, amphibians are extremely sensitive to environmental change and are often the first species to become locally extinct in a disturbed habitat.

It is thought that habitat loss is the primary threat to amphibian populations around the world, and the Leapfrog Conservation Fund will be used for management and protection of key habitats. Don Church, Executive Director of the ASA, said, “Habitat loss is the single biggest threat to the survival of amphibians worldwide. This million-dollar commitment represents a landmark in the battle to stem the alarming loss of frogs, salamanders and caecilians. We hope that it will encourage others to step forward and make a commitment to protecting amphibians and habitats.”

Although habitat loss is thought to be the primary cause of global declines, many other factors are also decreasing amphibian population numbers, including climate change, invasive species, over-collection and diseases such as chytridiomycosis.

Lemur leaf frog image

The Critically Endangered lemur leaf frog exists in just a few pockets of its former range due to the negative effects of habitat loss and chytridiomycosis

Action plan

The million-dollar Leapfrog Conservation Fund will be dispersed through the ASA and will be used to manage key amphibian habitats around the world. It is thought that there are around 940 amphibian species living in unprotected areas around the world, and many of these species have a very restricted range, which may be as small as a single stream or pond. The most threatened habitats will be prioritised and targeted for protection. As well as having a positive effect on the amphibians within the habitat, the fund will undoubtedly help to boost populations of other species.

Western Ghats waterfall image

Areas such as the Western Ghats rely on their amphibian biodiversity to sustain the ecosystem

Success story

Previous alliances between the ASA and other conservation organisations have been very successful. The forest of Sierra Caral in Guatemala was at risk of being destroyed for agriculture, before a team of amphibian specialists surveyed the area, finding 12 amphibian species, 5 of which were endemic to the area. Funds are now being raised to further protect the area and the species which inhabit it.

Partnerships are the key to success,” said Robin Moore, Conservation Officer with the ASA, Rainforest Trust and Global Wildlife Conservation. “We all have a stake in the future of our environment, and what is truly exciting about the Leapfrog Conservation Fund is that it represents an opportunity for unique collaborations to achieve a common goal – saving amphibians and habitats upon which we all depend.”

Hidden salamander image

The hidden salamander is one of Sierra Caral’s Critically Endangered amphibians

The future is bright

Dr Paul Salaman, Chief Executive Officer of the Rainforest Trust, said, “Amphibians represent an opportunity to stem biodiversity loss through relatively modest investments. We can literally save entire species through strategic habitat protection. We are thrilled to be able to make this commitment to protecting the most threatened vertebrate group in priority sites worldwide.”

For some amphibian species, such as the golden frog, it may be too late, but the Leapfrog Conservation Fund is definitely a step in the right direction to protect other species from a similar fate.

Golden frog image

The extinct golden frog has not been seen in the wild since 1989

For more information on the Leapfrog Conservation Fund or to apply for funding for a project, visit the Amphibian Survival Alliance homepage or contact Robin Moore at rdmoore@amphibians.org.

See the top 50 amphibians on ARKive, and many more amphibian photos and videos.

Hannah Mulvany, ARKive Content Officer.

Apr 27
Photo of golden frog on leaf

Golden frog (Mantella aurantiaca)

Species: Golden frog (Mantella aurantiaca)

Status: Critically Endangered (CR)

Interesting Fact: The toxins in the golden frog’s skin are obtained from its diet, and are lacking in captive-bred individuals that are fed on non-toxic prey.

The golden frog is a small, poisonous frog found only in a very small part of central-eastern Madagascar. As its name suggests, its skin is usually bright yellow, orange or red, and contrasts with its black eyes. The tips of its digits have adhesive pads. This tiny frog only grows to just over two centimetres in length, with females being slightly larger than males. It lives in damp, swampy areas of forest and breeds after the first heavy rains of the year. The golden frog lays its eggs in leaf litter, moss or under bark, and after the tadpoles hatch they either wriggle to water or are washed into pools by rain.

Its bright colouration makes the golden frog popular in the pet trade, and over-collection still occurs in some areas, although it is not yet known whether this is affecting the frog’s population. The golden frog is listed on Appendix II of CITES, which should regulate international trade in this species, and import of wild-caught individuals to the EU has been banned since 2006. A potentially more serious threat is the severe fragmentation of this species’ remaining habitat. This colourful frog is bred in captivity in a number of zoos and other institutions around the world, but it will also be vital to protect its remaining habitat if it is to survive in the wild.

Find out more about amphibian conservation at ARKive’s amphibian conservation page, Amphibian Ark and the IUCN SSC Amphibian Specialist Group.

See images of the golden frog on ARKive.

Is the golden frog your favourite species? Vote for it now in our World’s Favourite Species campaign!

Liz Shaw, ARKive Text Author

Apr 27

Save the Frogs DayToday marks the 5th annual ‘Save the Frogs Day’, an international event which focuses on raising awareness about the plight of the frog, encouraging conservation action and celebrating all things amphibian. In honour of this noble cause, we thought we would highlight some of our favourite weird and wonderful amphibians from around the world, and hopefully encourage you to get involved, spread the word about amphibian conservation and perhaps even host your own event. The ‘Save the Frogs’ website has some fantastic ideas for inspiration here, so what are you waiting for? Hop to it!

Titicaca water frog

Titicaca water frog photo

The largest truly aquatic frog, the Titicaca water frog can weigh up to 1 kg and is endemic to Lake Titicaca, which lies on the border between Peru and Bolivia. While its extremely loose skin gives it a bizarre appearance, the skin is very rich in capillaries, enabling the frog to remain underwater without having to surface for air. Unfortunately, the Titicaca water frog is under great threat as a result of over-collection for human consumption. It is blended with other ingredients to create a juice which local people misguidedly believe cures many ailments.

Gardiner’s tree frog

Gardiner’s tree frog photo

From one of the largest frogs to one of the smallest now, Gardiner’s tree frog. This diminutive amphibian is found in the Seychelles and grows to just 11 mm in length. Unlike most frogs, which must lay their eggs in water, this species lays them in small clumps on moist ground. Instead of hatching as tadpoles, the young then hatch as small, fully formed adults.

Dyeing poison frog

Dyeing poison frog photo

Perhaps one of the most beautiful of all frogs, the dyeing poison frog is famed for the alkaloid-based poison excreted from its skin. Its toxicity is obtained from its diet, which consists mainly of ants. Subsequently, in captivity the dyeing poison frog loses its toxicity as it cannot obtain these compounds through its captive diet.

Suriname toad

Suriname toad photo

A fascinating species from South America, the Suriname toad must surely take the prize for the most unusual reproductive methods in the animal kingdom. The male rolls the fertilised eggs onto the female’s back, after which the skin on her back closes around them. After an incubation period of three to four months the young emerge from her back as fully metamorphosed individuals. Cool or creepy? You decide!

Purple frog

Purple frog photo

Only discovered in 2003, the purple frog is the sole surviving member of an ancient group of amphibians that evolved around 130 million years ago. This strange-looking frog is adapted to a burrowing lifestyle, spending most of the year up to 3.7 metres underground and emerging for a few weeks to breed at the surface.

Rabb’s fringe-limbed treefrog

Rabb's fringe-limbed treefrog photo

Perhaps one of the saddest stories from the amphibian world, Rabb’s fringe-limbed treefrog was described as a new species as recently as 2008, but the arrival of the fungal disease chytridiomycosis in the only known population appears to have driven the species to extinction in the wild. As of early 2012, a single male remained in captivity, believed to be the very last of its kind anywhere in the world after the only other known individual, another captive male, was euthanised due to poor health.

Darwin’s frog

Darwin’s frog photo

Discovered by Charles Darwin, the unusual Darwin’s frog is another species with a rather strange method of reproduction. The male possesses a large vocal sac, but rather than producing a loud call, he uses it for an altogether different purpose. It is his job to guard the fertilised eggs, and after they have been developing for around 20 days he uses his tongue to pick them up and manoeuvre them into his vocal sac. The tadpoles hatch and metamorphose within his vocal sac, emerging from his mouth when their tails are reduced to stumps. Check out a video of tadpoles moving within a male’s vocal sac .

Get involved

Golden frog photoIf you’ve been inspired to do your bit for amphibian conservation we would love to hear what you are up to. Don’t forget that you can also vote for the golden frog in our current campaign to find the World’s Favourite Species and spread the love for frogs!

You can also check out our feature page on amphibian conservation and have a go at collecting uninfected mountain chickens in our Team WILD game!

Claire Lewis, ARKive Researcher

About

RSS feedArkive.org is the place for films, photos and facts about endangered species. Subscribe to our blog today to keep up to date!

Email updates

Sign up to receive a regular email digest of Arkive blog posts.
Preferred frequency:

Arkive twitter

Twitter: ARKive