Reptiles and amphibians constitute two separate orders but they are both alike in a number of ways. Both are cold-blooded, relying on heat from the environment to control their body temperature. On the other hand, reptiles have a horny, watertight skin covered by scales or scutes, whereas amphibians have smooth, moist skin that they use in respiration. There are more than 12,000 species of reptiles, including snakes, lizards, turtles, crocodiles, and the tuatara. Of the approximately 8,000 species of amphibians, 90% are frogs and toads – the remaining 10% is composed of newts and salamanders, and the worm-like caecilians. Below is a list of noteworthy reptiles and amphibians I have seen in some of the zoos I’ve visited.