Taken with a 90mm macro lense by a natural spring inhabited by salamander larvae. The picture was taken in Bielefeld (Post code33619) by a spring near to the Peter Berg. It is a geological natural monument as noted in the wikipedia page "Liste der Naturdenkmäler in Bielefeld" under "Geologische Naturdenkmale" Nr.2.3-63.
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<span class="int-own-work" lang="en">Own work</span>