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Prehistoric Shark Gallery Tour the Ancient Seas Make Your Own Shark
The American Museum of Natural History
The Search for Ancient Sharks
The weird "spine and brush" structure on the back of this 375 million-year-old maleStethacanthusmay have served as a sexual signaling device, making it easier for females to pick out potential mates, or was perhaps used in combat by males. Like many early sharks,Stethacanthuswas only a few feet long.


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Picture: Ivy Rutzky |
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