Turtles cannot protrude their tongues from their mouths, but they can smell. Flapping the loose skin under the chin or throat moves air over the Jacobsen’s organ. Tortoises and turtles do not have teeth. The growth rings on the scutes or scales on a tortoise cannot be used to determine the animal’s age with any degree of accuracy, as in most instances, growth spurts and interruptions in growth are determined largely by environmental conditions. Some species have hinges on either the carapace or the plastron, which allow closure of the shell. Source: PetPlace