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Clams are giant bivalves that inhabit the seas surrounding the Mushroom Kingdom and Yoshi's Island. They appear as semi-recurring enemies and obstacles throughout the Mario franchise. Their appearance changes slightly from title to title, but they retain their behavior of opening and closing their valves. A number of fictional species, including Clampies from New Super Mario Bros. Wii and Clambos from Donkey Kong Country, are derived from generic clams.
Super Mario series
Super Mario 64
Clams are present in Super Mario 64 and its Nintendo DS remake Super Mario 64 DS, appearing in Jolly Roger Bay and Dire, Dire Docks. Most clams in Jolly Roger Bay contain Red Coins, whilst the lone clam in Dire Dire Docks contains a Koopa Shell. If a clam is touched when it is opening or closing, Mario takes two points of damage. Clams open up for a small period of time when Mario approaches them.
Super Mario Galaxy
Super Mario Galaxy 2
In Yoshi's Story, Clams are generally harmless, but act much like underwater Warp Pipes from Super Mario Bros. 3, by blowing air up (nonetheless, these actually stop after a certain amount of time). Clams are usually found around Sea Cactus. They are rare, and even then they only appear in Stage 5-2: Lots O'Fish.
Paper Mario: Color Splash
In Paper Mario: Color Splash, Wendy O. Koopa the fourth boss waits for Mario inside a Clam before the battle with her. In battle, she attacks by summoning coins from the Clams and dunking them on Mario. She also summons Gold Shy Guys, Silver Shy Guys, and Ice Bros from them to aid her in battle if Mario fails to block the attack.
Names in other languages