By the time that the young bear grew to full adulthood , his parents and siblings had moved on to better hunting and fishing grounds . Yet , alas , the young bear still had an attachment to this place that he called home - as it was really the only home that he had ever known . Years went by .
According to the above context, answer the following question.
Why did the young bear 's family move on to better hunting and fishing grounds ?


The place they all lived ran out of prey as time passed .