Which of the following is not an amphibian?

Amphibians are those organisms that can live both on land and in water. Their body is divided into a head and trunk, while a tail may or may not be present.

Salamanders, toads, and frogs are examples of amphibians.

A tortoise belongs to the class Reptilia. They have a well-differentiated body which includes a head, neck, trunk, and tail. They are land reptiles and respire through their lungs. They lay eggs with leathery shells.