A crab was a crustacean native to Earth.
When Spock tried to match the sound of the Whale Probe to the sound of an Earth animal in the Klingon Bird-of-Prey HMS Bounty's phylum search mode, a crab was shown. (Star Trek IV: The Voyage Home)
Crabs were Ferengi delicacies. Grand Nagus Zek's son Krax was fond of crabs. (DS9: "The Nagus")
Keiko O'Brien often made crab rolls. (DS9: "Tacking Into the Wind")
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