SeaWorld put out a stunning video last week of a Japanese spider crab (Macrocheira kaempferi) cracking open its outer shell and seeming to clamber out of itself.
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To pull off this trick, the crab secretes enzymes that separate its inner body from the hard shell, and then it develops a "paper-thin" new shell underneath. This can take weeks, NOAA Fisheries writes. And when it's done, the crab gets ready to move out of its now too-small shell. To pull...