Scientists have rediscovered a long-lost species of mammal described as having the spines of a hedgehog, the snout of an anteater and the feet of a mole, in Indonesia's Cyclops Mountains, more than 60 years after it was last recorded.
Attenborough's long-beaked echidna, named after British naturalist David Attenborough, was photographed for the first time by a trail camera on the last day of a four-week expedition led by Oxford University scientists.
Echidnas share their name with a half-woman, half-serpent Greek mythological creature, and were described by the team as shy, nocturnal burrow-dwellers who are notoriously difficult to find.
The species has only been scientifically recorded once before, by a Dutch botanist in 1961. Short-beaked echidnas are common throughout Australia and lowland New Guinea.
Echidnas are nocturnal and shy, making them difficult to find at the best of times, and the Attenborough long-beaked echidna has never been recorded outside the extremely remote Cyclops Mountains of Indonesia's Papua region.
They are the last vestiges of an ancient animal line, explained James Kempton, a biologist from the University of Oxford who led the expedition.
"The reason it appears so unlike other mammals is because it is a member of the monotremes - an egg-laying group that separated from the rest of the mammal tree-of-life about 200 million years ago."
It took a team of scientists and experts from Britain and Indonesia four weeks and 80 camera traps to find the echidna, and it was only on the last day, and the final memory card of the trip, that the creature made an appearance.
Just a few seconds of black and white footage shows the slightly ungainly creature ambling through the undergrowth, apparently unaware of the excitement its very existence is likely to elicit.
"The discovery is the result of a lot of hard work and over three-and-a-half years of planning," said Mr Kempton.
The team relied heavily on guidance from the local community, who helped them navigate difficult terrain and granted them access to areas regarded as sacred.
In addition to the rediscovered echidna, the team found a kind of honeyeater bird not recorded since 2008, and a slew of underground species that are new to science.
Blind spiders, blind harvestman and a whip scorpion were all recorded in a previously unexplored cave system that was revealed only when a team member fell through a moss-covered entrance.
Among the more unusual findings was a new kind of tree-dwelling shrimp.
"We were quite shocked to discover this shrimp in the heart of the forest," said Leonidas-Romanos Davranoglou, the team's lead entomologist, theorising that the region's heavy rainfall creates an environment humid enough for the shrimps to live on land.
The discoveries came despite perilous conditions, with Mr Davranoglou breaking his arm on the trip and another researcher enduring a leech attached to his eye for a day and half before it was removed at a hospital.
For all the hardships, Mr Kempton described the landscape as "magical," and the team hopes their findings will highlight the desperate need for conservation of the region and Indonesia's remaining forests elsewhere.
"Tropical rainforests are among the most important and most threatened terrestrial ecosystems," said Mr Davranoglou.
