In the “Call of the Wild” by Jack London, Buck uses his abilities and instincts to adapt and survive in the harsh Yukon environment. At first, he is taken into the wild where he faces a daunting task of developing physical strength to pull sleds in the Yukon. Later, the dog gains knowledge by watching the others and learning new techniques that help him survive. In the end, the beast fully changes into a primordial killer that regains his ancestral traits to fight for survival. Buck changes from a spoiled pet to a dominant animal and grows use to his new environment. In the beginning, the main character has no choice but to survive in the Yukon and becomes tougher to do his job. After his kidnapping, he becomes a member of a sled team traveling to the Yukon. More dogs are brought onto the team, and they all fight for survival. The protagonist has to change and adapt to this new environment and get strength to pull the sled. “His development (or retrogression) was rapid. His muscles became hard as iron, and he grew callous to all ordinary pain. He achieved an internal as well as external economy. He could eat anything … and his blood carried it to the farthest reaches of his body, building it into the toughest and stoutest of tissues.” (24) After he is brought into the Yukon, the dog has to do hard, physical labor in pulling sleds. He becomes stronger and grows more muscles and can ignore most pain. Since he also has to change his diet, the beast no longer is well sated, but he competes with other hounds for food. He does not get much food, so he has to eat everything he is given to stay alive. From his physical development, the half St. Bernard is preeminently smarter, stronger, and quicker than most of the others. If dogs are not able to become stronger and more powerful, they become easy prey for enemies to obliterate. In conclusion, the Yukon environment is different from his old home, so he has to adapt and change his methods to survive.