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11 intriguing transparent animals

By: Bryan Nelson on Jan. 24, 2011, 11 a.m.
Glass Squid

Photo: Wiki Commons/GNU

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Glass squid

There are about 60 different species of glass squid, so-called because many of them appear completely transparent. This transparency keeps them hidden from predators, since they spend much of their lives in partially sunlit shallow waters.

Many species are bioluminescent and possess light organs on the undersides of their eyes. Since the digestive gland can still be seen through the transparent skin, it is typically held in a vertical position to reduce its visibility.