Ever seen a blue frog? The first time I saw them I could not believe my eyes. In early spring Moor Frog (Rana arvalis/Heikikker) males gather in ‘plopping’ mating choires in shallow water (which is slightly warmer) and turn bluish by a hormonal process. This lasts only for a couple of days. Weird!The photo below shows the miniature world of frogspawn. The pale colour of the water is caused by the reflection of dry grass which is illuminated by warm sunlight.
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