Titicaca frog
Also known as Telmatobius culeus, this amphibian gets its name from its homestead in Lake Titicaca, which sits 10,000 feet above sea level in South America. There's not a lot of air up there, and as frogs breathe through their skin, this presents a bit of a challenge. The solution to this is more skin. This frog can stretch over 20 inches wide.