Eep discovers fire for the first time. Fire allowed humans to fight, stay warm, consume healthier foods with more nutrients, and ultimately survive. Fire is one of the first discoveries that distinguished humans from other animals.

The Croods family attempts to capture an egg they stumbled across for breakfast. This illustrates the way that humans foraged for food before the development of agriculture.

Guy uses fire to save Eep and her family from the bloodthirsty birds, by using the fire as a weapon .

Eep's father tells the rest of the family a story about the dangers of curiosity and how it can lead the members of the family to die. He advises them to stay in their normal routine and not to think about anything new. While telling the story, he draws and paints on the walls.

As Keda makes his way home, he and Alpha experience hunting in the winter.