THE STORY OF KEESH: What does it mean that Keesh's father hunted over-keenly?

The story of Keesh is a short story which was written by Jack London. Keesh was a thirteen years old boy who lived at the North Pole a long time ago. He is the major character of the story. Keesh's father, Bok, had been a very brave man when a time of famine came, he was willing to sacrifice himself to go hunting a bear alone. The bears are wild animals, but he only thought of how his society could survive. After Bok's death, people around him tend to forget the sacrifice and struggle that he has done. The sacrifice which is forgotten means that Keesh father had the desire to save the society by hunting the bear. However, he failed and died. On the other hand, his sacrifice isn't respected by society. Keesh declared that he would honor his father's memory and became a great hunter, and bring back a wealth of meat for his people.