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Fluttershy didn't even bother with getting a merform: that's how passionate she is about the subject.

Remember! As a general rule, turtles (the ones with the webbed feet or flippers, for swimming) live in the water, whereas tortoises (with the ploddy, definitely-not-for-water legs) are one of the only things that can't swim. There's this song/vid, too!

"You get sea turtles, not sea tortoises."

EDIT: Okay, in American English it's acceptable to call all testudines 'turtles' (and in Australia they call some freshwater turtles 'tortoises'), but what I said holds true for British English and all English-speakers can agree that sea turtles aren't tortoises!