Nature is chock-full of ugly creatures. Animals like the wolf eel, the naked mole rat, the Matamata, the sea lampreys, and the Surinam toad are all notorious eyesores. But in all of those cases, their ugliness is just a consequence of their amazing evolutionary adaptations. This episode discusses the adaptations that make these animals look so ugly, but also help them survive in the wild.

pt. 1. The Wolf Eel: Ugly Creatures: Strange Creatures Series -- pt. 2. Ugly Turtles: Ugly Creatures: Strange Creatures Series -- pt. 3. Naked Mole Rats: Ugly Creatures: Strange Creatures Series -- pt. 4. The Sea Lamprey: Ugly Creatures: Strange Creatures Series -- pt. 5. The Surinam Toad: Ugly Creatures: Strange Creatures Series.