Check out Oliver's teeth in this video. Audio FixTortoises have a mouth which is like a beak kind of like a bird beak however, they have sharp serrated teeth and they have very strong jaw muscles. It's a good thing that it's not their nature to attack or try to bite as there are much more defensive creature and their first thought is how fast they can get inside their shell That's why Tortoises make a hissing noise. They're actually exhaling all of the air out of their lungs so they can get thei