"Alien-like" scenes of tadpoles feasting on eggs emerging from their mother have been caught on camera.
The footage marks the success of a captive breeding programme for the critically endangered mountain chicken frog, one of the world's largest frogs.
In April, 50 of the amphibian giants were airlifted from Montserrat after a deadly fungus swept through the island, devastating the population.
Now several breeding programmes are under way to save the frogs.
Once numbers have been boosted in captivity, researchers hope to reintroduce the frogs back into the wild within the next two years.
The remarkable footage was recorded at the Durrell Wildlife Conservation Trust, in Jersey, which took in 12 of the rescued frogs. Twenty-six others went to Parken Zoo in Sweden, and 12 are now housed in ZSL London Zoo.
So far, four pairs of mountain chicken frogs have started to breed - which could result in hundreds of frogs. And this has given researchers an insight into the way that these unusual amphibians care for their offspring.
"Mountain chickens have very peculiar breeding habits because they form foam nests in burrows in the ground," said professor John Fa, director of Durrell.
The females lay their eggs in these nests, which eventually hatch into tadpoles. But as the nests are underground, food is scarce - so the frogs need to find a way to provide nutrition for their young.
"In the case of mountain chickens, we have discovered that the female comes into the nest and starts laying a string of infertile eggs.
The tadpoles feast on the unfertilised eggs
"We thought that the eggs would come out and drop to the bottom of the nest and then the tadpoles would start eating them. But the footage shows about 40 tadpoles congregating around the female and eating the eggs as they come out of the female's body.
"Every now and again, the female uses her back legs to push the tadpoles away from her body so another set can come up and eat as much as they can."
"It is really weird - it is an alien scene. This is the first time we have caught this on film," professor Fa said.
The mountain chicken frog (Leptodactylus fallax) is one of the world's most threatened frogs. The frog is so called because its meat tastes like chicken.
It was once found on seven Caribbean Islands, but thanks to hunting and environmental pressures it is currently found only on Montserrat and Dominica.
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