Sticky fingers.

The article focuses on the White's tree frog, a large green amphibian found in Australia, which can climb slippery slopes and perch upside down. White's tree frog secretes mucus from its toe pads, and experts in the field have long thought that it is this fluid which helps the frog to cling on. In a paper published in "Interface," a journal of Britain's Royal Society, Walter Federle, of Cambridge University, and his colleagues demonstrate that the toe pads of the frogs are in direct and dry contact with whatever they are standing on, squeezing out the mucus layer. Whatever is holding the frog to the surface, it is not its mucus.