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11 intriguing transparent animals

By: Bryan Nelson on Jan. 24, 2011, 11 a.m.
Salpidae chain in the oceans of Malta.

Photo: Hartmut Olstowski/Wikimedia Commons

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Not to be confused with jellyfish, salpas are transparent, free-floating tunicates. Their gelatinous bodies swim by contracting and pumping water through internal feeding filters, feasting while they move.

They can be found anywhere, but they are probably most common in the Southern Ocean, where they sometimes form enormous transparent swarms.