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Clamu is a dark purple pearl oyster with periwinkle lips. She has a pink-red tongue. She also has some dark purple spots on her shell.
Clamu is a pearl oyster at the Bikini Bottom Zoo who regularly performs tricks for visitors. The most popular trick she performs is spitting a pearl 100 feet into the air.
In the episode "The Smoking Peanut," SpongeBob goes to the Zoo on Free Day and goes to the Oyster Stadium, where Clamu was sleeping. SpongeBob wants to see her perform tricks, so to wake her up, he throws a sea peanut at Clamu, causing her to wake up and start wailing loudly. She also throws one of her trainers, Joe, out of the Oyster Stadium. Her crying could be heard around the world, even on the surface. SpongeBob feels guilty of causing Clamu to feel so bad, especially when Patrick was arrested instead of him. At the end, however, it is revealed that the person who really caused her distress was Mr. Krabs, who stole her egg, believing it to be a pearl, and free to take on Free Day. Fortunately, a zookeeper reclaims the egg and gives it back to Clamu. The egg then hatches, officially making her a mother. The citizens then angrily throw peanuts at Mr. Krabs for stealing the baby clam.
Clamu is emotional when her baby was stolen. Though, when unprovoked, she is calm and known to do tricks as mentioned in "The Smoking Peanut."
Clamu's name is a parody of SeaWorld's popular orca whale, Shamu.