All turtles have lungs - not gills. They hold their breath when they dive.
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Turtles are a type of reptile. All reptiles breathe air using their lungs, and that includes turtles. Sea turtles, which spend their lives in the water, have special physiological adaptations that permit them to hold their breaths for a prolonged period of time, but they still have to surface every so often to breathe air.