Answer: The tone of the poem changes from calm/peaceful to melancholy throughout the story
Explanation: The Bull Moose is a poem which explores the gap between nature and humanity. It judges and criticizes humans while also exposing that nature is dying. It makes awareness of how humans are mistreating nature specially through the symbolism of moose. So as the poem progresses it's like the author is exposing the sad truth, which may be painful but is the truth nonetheless.