a whole storyline is about the bond between a young Indricothere and its mother, with a dramatic scene where the mother breaks that bond to have another child
Episode 2 features prehistoric sharks. Although not named in the episode, the sharks are a type named Physogaleus. They are prey for the massive ancient whale Basilosaurus, but are still ferocious hunters themselves, as shown when one bloodily kills a Apidium (a type of prehistoric monkey).