With a sleek, eel-like body and beady eyes, the aquatic caecilian is quite an unusual amphibian. They look like a cross between a snake and an eel, but they are neither. Just like frogs and salamanders, caecilians are amphibians. They are native to the Amazon River Basin in South America and spend their entire lives in the water. . . . There are some key differences between caecilians and other species of amphibians. Many amphibians can exchange oxygen through their skin via a specialized membra