Eep blows into a horn, frightening the family and causing them to destroy it as a group. Humans, like many mammals, are social animals and used to hunt and live together in packs. A group of humans could accomplish much more than an individual.
When Aang and his friends encounter a giant canyon, they are asked to guide two refugee tribes across. However, they face many issues due to the two tribes' long, bitter history. Both tribes retell their version of the story behind their feud.