The Pseudis Paradoxa is the Benjamin Button equivalent of the amphibian world. The paradoxical creature starts off as a 25-cm-long tadpole and shrinks as it grows. ending up as a small tropical frog, about a quarter of its original size.
When biologists discovered the paradoxical frog in the South American wild,they were understandably confused. At first, they thought the adult frogs were actually the babies, which later grew into giant tadpoles, exactly the opposite of how every other frog species in the world develops. They later figured out that the 11-inch tadpoles were indeed the juveniles, but still couldn’t explain the bizarre phenomenon.