Spiky croaker

"I was so mad at myself! I thought I had brought back the wrong frog," says biologist Katherine Krynak, who was surveying amphibian species in the Reserva Las Gralarias in Ecuador. The marble-sized creature was spiky when she spotted it, but smooth when she examined it back at the labr. In fact, she had discovered the first vertebrate species known to change its skin texture.t

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