Some types of turtles can actually breathe through their bum holes. The Fitzroy River Turtle, native to Australia and the Eastern Painted Turtle of North America are known for being able to breath through their bums. This was discovered when scientists put some food colouring into the water near the turtles. They noticed that the turtle took in water from both the rear and the front ends. The bums of the turtles, called the cloaca contain a sack called the bursae and this is what is used by the turtles to pump air in and out of their bodies. It has been hypothesised that turtles have do this because their shell prevents them from breathing in the same way that most other animals breath.