Stock Photo - Blue coloured male moor frogs (Rana arvalis) in a pond in Klein Salitz, Germany, 4 April 2016. During pairing season, the male animals can make their skin appear blue-violet or even sky blue due to spectral reflection. The reason for the colour change has so far not been entirely explained, the visual signals are either meant to attract females or fend of competeing males. Photo: Jens Buettner/dpa | usage worldwide. - Klein Salitz/Germany

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