Nature curiosity: Why and how do turtles breathe with their butts?

How do turtles breathe while they are underwater all winter? By breathing through their butts, so to speak.

Mary River turtle in Australia faces extinction, group says

10 Tremendous Turtle Facts

Can turtles really breathe through their butts?

Como uma tartaruga pode viver tanto em uma escala de centenas de anos? Seu mecanismo lento está fazendo isso? - Quora

What's a curiosity about turtles? - Quora

Sea Turtles Facts and Conservation - DPM Diving

10 totally awesome facts about turtles! - National Geographic Kids

Do Fish Drink? Office for Science and Society - McGill University, fishes

O que acontece com as tartarugas se você pintar o casco delas? - Quora