Why does hearing a bird outside the hospital remind sal of home?

Hearing a bird outside the hospital evokes memories of home for Sal because it symbolizes a sense of freedom and tranquility often associated with nature. Birds are often linked to peaceful, carefree moments in one's life, and their song can transport Sal back to familiar and comforting environments. This connection highlights the emotional ties between nature and personal experiences, providing solace during a challenging time in the hospital.