A species of frog so tiny that several of them could fit on a fingernail with room to spare has been found hopping around the forests of Papua New Guinea. At 0.27 inches long, Paedophryne amauensis is the smallest frog ever discovered and, by some measures, is the world's smallest vertebrate. The only smaller creature with a backbone is the male of a species of anglerfish, but they spend their lives fused to much larger females.
The tiny frog lives in leaf litter on the forest floor, where it eats incredibly small insects. Finding them after their insect-like calls had been detected was no easy task, a Louisiana State University researcher tells the BBC. "It was night, these things are incredibly small; so what we did after several frustrating attempts was to grab a whole handful of leaf litter and throw it inside a clear plastic bag," he says. "When we did so, we saw these incredibly tiny frogs hopping around." (Read more amphibians stories.)