The Zoological Society of London (ZSL) has successfully bred the rare Lake Oku clawed frog.

One of the world’s most critically endangered frogs, which lives in just one African lake, has been bred for the first time in captivity.

The Lake Oku clawed frog is 35th on the list of the world’s most at risk animals and was in danger of becoming extinct within the next decade because of invasive fish and disease. However the Zoological Society of London (ZSL) said it had successfully bred the frogs for the first time, which should ensure the future survival of the species.

Ben Tapley, head of the reptile and amphibian team at London Zoo said: “These critically endangered amphibians represent a unique branch of the evolutionary tree of life.

“Due to their restriction in the wild to just a single and relatively small site, they’re incredibly vulnerable to threats of invasive species or disease, which would be catastrophic if introduced to Lake Oku.”

Native only to the single high altitude freshwater lake in Western Cameroon, the small, totally aquatic frogs are some of the most genetically unusual creatures in the world, having developed extra chromosomes during their evolution.

The team at ZSL has spent years working closely with field biologists studying the conditions of Lake Oku so that the exact environment could be recreated at London Zoo.

Four of the thirteen tadpoles have already metamorphosed into juvenile frogs, and ZSL’s team of zookeepers have been working tirelessly to ensure the precise conditions are maintained for the amphibians. It is the first time that the tadpoles have ever been seen.

Mr Tapley added: “We will now be able to share our insights gleaned from naturally breeding these frogs with conservation biologists working with the species in Cameroon and zoos around the world to help ensure a sustainable population can be maintained.

“It’s a phenomenal achievement for the survival of this species.”

The Lake Oku clawed frogs can be seen at the amphibian and reptile house at London Zoo.