Turtles have a cloaca. It is an orifice on their bodies that they urinate, defecate, lay eggs, and (in some species) can absorb oxygen from. While it is not their main way of breathing, it helps while they are eating, laying eggs and especially when they are submerged for extended periods of time.I found this information on page 151 of The Totally Awesome Book of Useless Information by Noel Botham.
You will learn more details about this ability on page 208 of Turtles, Tortoises and Terrapins by Ronald Orenstein. He also tells us there are about 30 breeds of soft shell turtles. One example is the Fitzroy River Turtle which lives in fast running water where it can remain submerged for days, or even weeks at a time. Mr. Orenstein’s book has wonderful photographs of all aspects of these amazing animals. It also explains the differences between turtles, including the different ways they pull their heads into their shells: the Pleurodira, which translates to “side neck”, fold their necks sideways while the Cryptodira, known as hidden-necked turtles,pull their heads straight back into their shell.
Sea turtles can be amazingly large. A sea turtle can weigh as much as a water buffalo! Mission Sea Turtle Rescue by Karen Romano Young is full of fun facts, photos and valuable information about conserving the species. This is a must read for anyone planning on vacationing near a tropical beach. Another great book is Sea Turtles by James R. Spotila.
Turtles aren’t the only ones with shells! Shell by Alex Arthur tells about all kinds of shells: sea shells, egg shells, fossilized shells and many others are all in this book.
Lastly, turtles “cry.” This is their way of forcing the extra salt from their bodies that they ingest from drinking sea water. I don’t think that “turtle tears” will catch on nearly as well as “crocodile tears” but who knows?