Found this: Hope it helps, They "hear" more through the ground vibrations and they have a great sense of smell.

Turtle sense

Turtles and tortoises do not have ears like ours, but they can feel vibrations and changes in water pressure that tell them where food, or a predator, might be. They do have a good sense of smell, which helps them find food. The skin of a turtle or tortoise, especially the land tortoises, may look leathery and tough but it is actually very sensitive. In fact, keepers at the San Diego Zoo have found that the Galápagos tortoises Geochelone nigra really enjoy having their necks rubbed. They close their eyes in contentment, and will follow the keepers around wanting more!

Some turtles seem to have senses or instincts that we do not fully understand. Tracking equipment shows that some sea turtles migrate thousands of miles (kilometers) through the sea on regular routes, returning every two or three years to the same beaches to lay their eggs. No one knows how sea turtles find their way over that great distance, year after year, to the same beaches.


AND THIS:

Tortoises don't have ears, so they do not "hear" as we humans think of it. However, they are very tuned into vibrations. Imagine what it would be like to have so much of your body being hard and flat on the ground. You would pick up much more of what was going on around you through the vibrations.

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