The final installment of this series explores the world of scent and examines the animals that have pushed their sense of smell far beyond human capabilities. We'll see how you can defend against Sharks using a small pouch of liquid, swarms of bees being controlled by tiny traces of scent, and some skunks. It's not exactly a lion in the Serengeti, but seeing as the rest of the season has been so good, we'll give this episode the benefit of the doubt.