I'm wondering about how much noise tortoises can tolerate. I'm planning on getting a Mesopotamian Greek tortoise in the near future, and to have it live in a vivarium some of the time, but an outdoor pen when weather is favorable. However, the best place for a pen- in terms of sunlight and plant life- is about 15 feet from our emergency propane generator, which we turn on whenever the power goes out. Will the noise of it running bother the tortoise? It's loud enough that standing next to it isn't good for hearing, but not deafening.