On the sight question, tortoises can see light in the uv spectrum which humans can't. And they see in colour not black and white. My belief is that beyond a few metres their sight in poor though.
Tortoises live on the ground and are very sensitive to vibrations, which is sort of like a sense too.
My belief is that their hearing is poor compared to humans.
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Testudo Hermanni Hermanni (Corse) tortoises
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