Marta Neri
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Transparency is a trait shared by all living glass frogs. In some species though, such as the Condor Glassfrog (Centrolene condor), the ventral peritoneum is white anteriorly, obscuring thus the heart and liver. (Photo by Alejandro Arteaga on Flickr)

Transparency is a trait shared by all living glass frogs. In some species though, such as the Condor Glass Frog (Centrolene condor), the ventral peritoneum is white anteriorly, obscuring the heart and liver. Photo by Alejandro Arteaga.