The Crystal Frog
Scientists have been unable to explore the ecologically rich forest on Peru's border with Ecuador for many years because of the violent armed conflict in the region. When they finally had the opportunity to discover the region in 2009, they found a rich ecosystem with species they had not yet discovered. Among the exotic animals they found was the crystal frog, where the skin of this frog was completely transparent and through this transparent skin we could see its heart beating.
source
https://www.facebook.com/LwhatyAljmylt/photos/a.175222999282198/1261225904015230/?type=3&theater
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