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Fish Bones (also known as Fishbones and Wet Bones) are skeletal, undead versions of Cheep Cheeps which first appear in the game Super Mario World. Despite this, they are often larger than living Cheep Cheeps, and have completely different tail fins. In later games, they take on torpedo-like qualities.
Super Mario series
Super Mario World / Super Mario World: Super Mario Advance 2
Fishbones are found in the submerged Vanilla Fortress and the underwater room of Bowser's Castle. They are the only strictly aquatic dungeon enemies in the game, though terrestrial enemies are also found underwater in these levels. Their behavior is simple, traveling in straight lines across the screen in a jerky, darting motion, usually in small groups. Fishbones can be defeated by Caped Mario or Caped Luigi's spin attack, but only in Super Mario Advance 2, and are otherwise invincible.
New Super Mario Bros. Wii
Wet Bones inhabit some water levels in New Super Mario Bros. Wii; they appear in World 4- and World 5-. Also, in the battle against Wendy O. Koopa in World 4-Castle, various Wet Bones can be seen swimming in a water tank in the background.
They now have a new attack pattern: if a Wet Bone detects one of the characters, it will lock on to them (as their eyes turn red) and launch themselves in the direction of the character. If it misses and hits a wall or another Wet Bone, it will crash and break apart in a similar manner to that of Dry Bones (the sound effect is longer if it hits another Wet Bone). However, once they break apart, they will reappear if the player goes far enough offscreen. Wet Bones can be permanently defeated with Ice Balls, a thrown object, or a Star. Wet Bones will stop following a player that jumps out of the water; the player can also dodge them by walking on the floor and ducking once spotted, which turns the Wet Bone's eyes back to normal and stops the chase.
In dark caverns, their eyes light up, although the illuminated area around them is much smaller than that provided by Bulbers and thus far less useful. In the Prima Games guide, they are mentioned under Dry Bones in the list of enemies and are presumably renamed as a contrast to them.
New Super Mario Bros. 2
Fishbones re-appear in New Super Mario Bros. 2, where they keep their design and attack pattern from New Super Mario Bros. Wii and Super Mario World. They only appear in World 3-, World Star-3, and World Star-6. In this game, Fishbones do side flips when a vocal riff "bah" is heard, similar to Cheep Cheeps.
New Super Mario Bros. U
Super Mario Maker / Super Mario Maker for Nintendo 3DS
Fish Bones reappear in Super Mario Maker and Super Mario Maker for Nintendo 3DS. When placing a Dry Bones in the Underwater level style and testing the level, Dry Bones turn into Fish Bones. Additionally, new sprites for Fish Bone have been made for the Super Mario Bros. and Super Mario Bros. 3 styles. Fish Bones use once again their attack pattern from New Super Mario Bros. Wii in all game styles as well. In the Super Mario World and New Super Mario Bros. U styles, Yoshis can eat Fish Bones and spit out bones that fly in straight lines ahead of him. It acts similarly to the fireballs from Super Mario World, but can also defeat many fireproof enemies such as Buzzy Beetles and Chain Chomps.
Super Mario Run
While Fish Bones do not appear as enemies in Super Mario Run, they can be seen inside the ground in desert levels.
Super Mario Maker 2
Fish Bones reappear in Super Mario Maker 2, and are now completely separate from Dry Bones. Thus, they can now be placed on land. Parachutes can also be attached to them. However, they fall apart whenever they touch the ground. In the nighttime sky and airship themes, Fish Bones are able to swim in the air, and can be defeated with a stomp. They also appear in the Super Mario 3D World style despite not appearing in the source game itself.
Mario Kart 7
Fish Bones make their first Mario Kart appearance in Mario Kart 7 and take their design from New Super Mario Bros. Wii. They are found in Wario Shipyard, where they swim in schools or sometimes alone. Any drivers that collide into Fish Bones will be pushed back.
Mario Kart 8 / Mario Kart 8 Deluxe
Super Mario World television series
Fishbones, though never referred to as such, made several small appearances in the Super Mario World cartoon.
A Fishbone first appeared in the episode "The Wheel Thing", where one is used by Yoshi to cut a log into wheels to be used in Mario's car factory. In "The Night Before Cave Christmas", both Mario and Oogtar use a Fishbone to cut-down several Christmas trees.
Super Mario Adventures
In the Super Mario Adventures comic, Fish Bones, along with several other creatures such as Urchins and Porcupuffers, are shown to act as guards/obstacles in the moat surrounding the Koopalings' tower.
Mario & Luigi series
Mario & Luigi: Bowser's Inside Story
Fish Bones make another appearance in Mario & Luigi: Bowser's Inside Story during the battle with Junker. When Mario and Luigi manage to defeat a Junker Can, a Fish Bone may attempt to attack the plumbers. It attacks by orbiting around one of the two and eventually ramming them, though it can be stopped by counterattacking with the hammer before it does. They do not reappear in Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, where their role is taken by Scutlets instead.
Mario & Luigi: Dream Team
Mario Party series
Mario Party 4
In the minigame Mushroom Medic in Mario Party 4, there is a poster in the background with a Cheep Cheep and its Fish Bone X-ray. Of note is that the tail fin in the picture is much too large for the accompanying Cheep Cheep's tail fin.
Mario Party 9
Fish Bones make their Mario Party debut in Mario Party 9, using their New Super Mario Bros. Wii design. Fish Bones only appear during the Blooper Beach Captain Event; when the player lands on an Unlucky Space in that section of the board, a group of Fish Bones attacks them and steals five of their ten Mini Stars.
Mario Party 10
Fish Bones reappear in Mario Party 10 in Whimsical Waters. In Mario Party mode, they are present at Unlucky Spaces and deduct Mini Stars from players landing on said spaces; in Bowser Party mode, they are found in treasure chests during Dragoneel Treasure events, and take away half of the current captain's hearts if their chest is selected.
Super Mario Party
Paper Mario: Sticker Star
Fish Bones make an appearance in Paper Mario: Sticker Star. They appear in Jungle Rapids, leaping in the water and attempting to destroy the raft Mario uses to cross through the river. They can be removed using the hammer. They were originally going to be fought as enemies, but were cut from the game.
Names in other languages