A new species of armoured catfish that eats wood with spoon-shaped teeth has been discovered in a remote area of the Amazonian jungle in Peru.

Scientists from the US National Science Foundation made the discovery during an expedition last month to a national park in the Alto Purus area of northeastern Peru.

The fish, which reaches 70cm long (2ft 3 ins), have evolved "spoon-shaped teeth" specialised in scraping tree logs that fall into the river waters.

The indigenous people have long eaten the fish which they catch by shooting them in the water, but it is the first time a specimen has been caught alive to be studied by scientists.

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