Pristimantis mutabilis, also known as the mutable rainfrog or "punk rock" rainfrog, is a species of frog in the family Strabomantidae. It is found in the Ecuadoran Andes of Pichincha and Imbabura provinces. Pristimantis mutabilis is the first known amphibian species that is able to change skin texture from tuberculate to almost smooth in a few minutes, an extreme example of phenotypic plasticity. The specific epithet mutabilis (changeable) refers to this ability. The physiological mechanism behind the skin texture change remains unknown.
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