What motivates Buck to return to the wild?

Buck's return to the wild is primarily driven by his instinctual call and deep longing for freedom. Throughout "The Call of the Wild," Buck undergoes significant transformations, transitioning from a domesticated pet to a creature more in tune with his primal instincts. As he experiences the harsh realities of life in the wilderness and the struggles of survival, he begins to feel a powerful connection to his ancestral roots. The call of the wild symbolizes a pull towards a life that is natural and free, resting deeply in his instincts that have been awakened by his experiences. This longing for freedom and the innate call of the wild ultimately compel Buck to embrace his true nature and return to the life of a wild animal, highlighting the theme of survival and the enduring power of instinct.