There are a very few species of turtles that have a large cloacal bursae that is highly vascular and capable of oxygen-carbon dioxide exchange. Please refer to the related links rebuttal at the bottom of the article on The Straight Dope.
Turtles have extraordinary anaerobic capacity--they have survived up to 33 hours in a pure nitrogen atmosphere. (Most reptiles have a high anaerobic capacity compared to mammals, but even they can't...
A very few species of turtles have cloacal bursae that are rich in blood vessels and can undergo oxygen exchange. The vast majority of turtles do not have cloacal bursae, or if they do, they cannot...
Yes. Although turtles breathe normally, they have a pair of sacs in their butt that are capable of taking in water, extracting oxygen from it, and then expelling it. They can get up to 68% of their...