DR MORLEY READ / SCIENCE PHOTO LIBRARY DR MORLEY READ / SCIENCE PHOTO LIBRARY
Rana palmipes. Mating male (smaller) and female frogs of the species Rana palmipes - the only true frog (family Raninae) native to the Amazon rainforest. True frogs are distinguished from their relatives by a bony sternum and tapering fingers without discs or pads. Photographed in Ecuador.
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