Rana arvalis

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The moor frog (rana arvalis) normally has a brown color with stripes on their back. But during breeding season the male moor frog turn blue for two or three days. A nice example of sexual selection. They do not only use the blue color to attract the female but they also sing a song that sounds like drowning guinea pigs.

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~ by jonathanfilius on March 11, 2014.

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