Dorrie
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Dorrie is a large, marine dinosaur-like beast in Super Mario 64 who lives in an underground lake in the Hazy Maze Cave. She spends her days swimming in circles but will gladly give someone a ride if they get on her back. It is also possible to steer Dorrie. Just face the desired direction on her head and and she will swim in that direction. Interestingly, a sign states that she might eat visitors if they get too close (although she has never been seen doing as such).
Dorrie also, of course, appears in Super Mario 64 DS. However in the game she has goggles and looks more like a Yoshi. She does the same thing she does in Super Mario 64.
Dorrie returns in the New Super Mario Bros. game, and has goggles like in Super Mario 64 DS. Mario can ride on her back to cross large bodies of toxic water in certain levels of World 4. If Mario Ground Pounds Dorrie, she will move faster through the water.
Dorrie is a reccuring minor character in the Mario Party series. Although only directly appearing in a few such as Mario Party 3, a lot of aquatic equiptment, such as boats, are based on Dorrie.