A frog named after Charles Darwin is now extinct because of a skin disease, say scientists.
Darwin's frogs were named after the father of evolution, who discovered them in 1834 in Chile during his voyage around the world on the ship HMS Beagle.
They are notable for having evolved to escape predators by looking like a dead leaf, with a pointy nose, and the fact that the males carry young tadpoles around inside their vocal sacs.
Researchers think the northern Darwin's frog, one of two species, has been killed off completely by a fungal disease called chytridiomycosis that infects their skin. Numbers of the related southern species have plunged dramatically.
An analysis into the spread of the disease by a team from the Zoological Society of London (ZSL) and Chile's Universidad Andres Bello found that habitat loss contributed to the decline, but this alone could not explain the animal's demise.