We review all that we've learned in this final episode.

We try to figure what "species" really means.

We try to answer mysteries from DNA sequences to where all the baby eels are!

We explore parasites' ecology and evolution in our ecosystem.

We dive into the amazing ways animals interact with each other.

We explore sex and gender and how animals pass down genetic information.

We discuss how animals use senses to explore their environment and communicate.

We explore the evolution of ears and animals' genetic adaptations of them.

We walk through the history of eyes, how they work, and vision's evolutionary advantage.

We take a closer look at brains, how animals use them, and how some evolved to lose them.

We explore carnivores, herbivores, and omnivores and how animals help redefine food.

We take a look at the various ways animals can grow.

We try to figure out what that “average” animal would really look like.

So what is an animal anyway?