What might a possible theme be for this short story?

# What might a possible theme be for this short story? What can we learn from it? How did you come to this conclusion?
What is more integral to survival: instinct or imagination? Explain.
Discuss the conflict (in other words, identify the conflict: man v man, man v nature, man v self, etc.) and how it can relate to life today.
What figurative language, if any, does London favor?