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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.
Super Mario series
Super Mario 64
In Super Mario 64, Clams appear, but they don't have life and are just objects that have items in them. They appear in Jolly Roger Bay and Dire, Dire Docks. In Jolly Roger Bay, many of the clams have a Red Coin in them, and one even has a Koopa Shell inside. The player must make sure to collect the items in time before the clam quickly closes. They inflict up to two segments of health.
Super Mario Galaxy
New Super Mario Bros. Wii
Super Mario Galaxy 2
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 Guys, Silver Guys, and Ice Bros from them to aid her in battle if Mario fails to block the attack.
Names in other languages