They’re very dense, so they sink to the bottom. Once there they just run, and those legs need to be strong in the first place to hold up their bodies in the first place. at which point, inertia takes over and it’s harder for them to stop rather than continuing to move.
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They’re very strong and they run along the bottom, not swim.
They are heavy, more muscle than fat by far. They run along the bottom of shallow bodies of water, and they are quite fast on land, too.
They propel themselves by sinking and then bouncing off the bottom.
They’re very dense, so they sink to the bottom. Once there they just run, and those legs need to be strong in the first place to hold up their bodies in the first place. at which point, inertia takes over and it’s harder for them to stop rather than continuing to move.