What is the main message of this excerpt of White Fang? Please respond in three to five complete sentences, including specific sections of text to support your answer.
Breakfast eaten and the slim camp-outfit lashed to the sled, the men turned their backs on the cheery fire and launched out into the darkness. At once began to rise the cries that were fiercely sad-cries that called through the darkness and cold to one another and answered back. Conversation ceased. Daylight came at nine o'clock.

Question

What is the main message of this excerpt of White Fang? Please respond in three to five complete sentences, including specific sections of text to support your answer. 
Breakfast eaten and the slim camp-outfit lashed to the sled, the men turned their backs on the cheery fire and launched out into the darkness. At once began to rise the cries that were fiercely sad-cries that called through the darkness and cold to one another and answered back. Conversation ceased. Daylight came at nine o'clock.