There's strength in numbers. Especially in the wild. For many species, it's the very reason why individuals come together. Protecting the empire is imperative to survival. For these animals, protection means isolation - finding sanctuary from the threats outside their boundaries. In this episode, we examine penguins, kangaroos, and sharks.

pt. 1. Sanctuary: Western Grey Kangaroo -- pt. 2. Sanctuary: Penguins -- pt. 3. Sanctuary: Lemon Sharks.