Coral Reef Fact:
Krill photo: NOAA
Krill (shrimp-like crustaceans in the Euphausiidae family) are one of very few creatures that can do a reverse molt into a smaller shell when food is limited.
Fact Source: http://factsanddetails.com/world.php?itemid=1253&catid=53&subcatid=338#70
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