Woolly rats are found in Indonesia and Papua New Guinea, usually in mountain forests or mountain grasslands. Some woolly rat species are called giant rats, since they can weigh almost a kilo and a half. That's about three to six times what a typical pet rat weighs.
Scientific name: Mallomys
Black and white images from a camera trap reveal a new species.
One way to find interesting animals in the unexplored forests is to set up camera traps, in the hope you find something interesting. Cameraman Gordon Buchanan and mammal expert Kris Helgen come across some pictures of what might just be a new species of giant woolley rat living in the crater of Mount Bosavi.
One of the world's largest rats would give a house cat a run for its money.
In Land of the Lost Volcano, Gordon Buchanan is called to the discovery of a very special animal. It's a completely new species of rat... but it's the size of a cat. Unafraid of humans, thanks to the remoteness of its mountain home, the giant rat happily grooms itself while the team sits around discussing it, completely awestruck.
Take a trip through the natural world with our themed collections of video clips from the natural history archive.
Watch the year's highlights from the BBC's exploration of the planet's hidden corners and rarest creatures: from the turquoise seas of the South Pacific to the Lost Land of the Volcano.
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