Word: ribbontail
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...million years ago, and after about 200 million years of evolutionary trial and error, nature pretty much ran out of ways to improve on its handiwork. Today more than 350 species swim the planet, ranging in size from the less-than-1-ft.-long dwarf shark and pygmy ribbontail catfish shark to the 50-ft. whale shark. Sharks have insinuated themselves into every marine environment from the Arctic to the tropics. One species, the bull shark, even ventures into rivers and lakes as far as 2,000 miles from the nearest salt water...
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