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Beware the Sand Striker
Radiolab
The Sand Striker: A History of Predation
The oldest we know of lived 400 million years ago in the Devonian Age and grew to around three feet long. Unlike dinosaur bones or ammonite shells, the squishier worms did not fossilize easily. Sand strikers described the species of extinct worm solely based on its jaws as no vestige of its soft body remains. Another prehistoric sand striker from just 20 million years ago left a series of L-shaped burrows found in northeast Taiwan.
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