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A Lunge Fish is a big fish that will eat Yoshi and Baby Mario whole in Super Mario World 2: Yoshi's Island, Yoshi's Island: Super Mario Advance 3, Yoshi's Island DS, Yoshi's New Island, and Yoshi's Woolly World. Its name is a pun on the type of fish known as the "lung fish".
Lunge Fish hide in the water, and, like their name implies, will lunge at Yoshi as he passes by. Occasionally, a Lunge Fish will stick its head out of the water. Yoshi can then throw an egg at the fish to momentarily stun the creature. In one level of Yoshi's Island DS, Yoshi must travel in a boat over a lake infested with Lunge Fish. If Yoshi falls in the water, a Lunge Fish will attempt to swallow Yoshi and the baby he is carrying whole similar to how a Boss Bass does.
The Lunge Fish also appears as a playable character and an opponent in Tetris Attack, being paired with Flopsy Fish. In this game, it has become a slight friend of Yoshi's, enchanted by Bowser and Kamek to work for them. It also notes that it really doesn't like Yoshi much, since Yoshi gives it indigestion. It replaces Neris, the sea fairy from the Japanese version of the game.
Lunge Fish appear in Yoshi's Woolly World as an enemy in some stages with water. In this game, Lunge Fish are modeled on coin purses, with their lips being made of coin purse clasps. Yoshi can defeat them with yarn balls or watermelon seeds, earning a handful of beads, but they will respawn quickly.
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