Not only are these little peepers with the big names -- Paedophryne amauensis and Paedophryne swiftorum -- the smallest frogs known to man, they are also believed to be the smallest vertebrates on Earth, said the report in the science journal PLoS ONE.
Until now the smallest vertebrate was believed to be a transparent Indonesian fish known as Paedocypris progenetica that averaged about eight millimeters (one-third inch).
The largest vertebrate is the blue whale, measuring about 25.8 meters (yards).
The little land frog Paedophryne amauensis comes in at a whopping 7.7 millimeters, or less than one-third of an inch. The other newly discovered kind, Paedophryne swiftorum, measures a bit over eight millimeters.
"It was particularly difficult to locate Paedophryne amauensis due to its diminutive size and the males' high pitched insect-like mating call," said Louisiana State University scientist Chris Austin, who discovered them.
"But it's a great find."
The dark brown frogs with bluish-white specks have likely existed for a long time, underfoot and out of sight on the rainforest floor, eating smaller prey or being eaten by bigger predators.
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