Sorry to hear that Maddy. I can't think what the cause might be. Since you have shade plants and hides available and water I don't think this is down to the weather. Overheating can happen but only if there is no escape from the heat.
All seemed fine and then suddenly two died? I'm wondering if it could be some kind of poison. Was there any sign of injury? Sorry I'm not much help.
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Testudo Hermanni Hermanni (Corse) tortoises
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