What does Grendel's relationship with nature -- the ram the sky grass the doe the baby bird owls and wolves reveal about his own personality?

The dichotomy of nature allows it to be both good and bad. Grendel can only see one side, the bad. He associates the coming of Spring, a beautiful time for most, with the murders and evil he has committed. He's unable to relate to the miracle of rejuvenation, birth and rebirth in any way other than with anger and disgust.