What does Buck do when he hears the call of the wild?

When Buck hears the call of the wild, he becomes increasingly drawn into the wilderness and his primal past. This moment signifies a pivotal transformation for him, as he begins to reconnect with his ancestral instincts and the untamed life that lies within him. The call symbolizes not just a longing for freedom but also an awakening to the natural world and the fundamental instincts of survival that dogs possess.

His response to the call demonstrates his journey from domestication to embracing his wild heritage. As Buck navigates the challenges of the harsh wilderness and the brutality of life as a sled dog, he starts to understand his true identity and the power of instinct over training and civilization. This transformation reflects the central themes of the novel, including the struggle between nature and nurture and the inherent pull of one's origins.