A young gray seal pup named Muse is back in the wild after rehabilitation, months after he reached Wales in poor condition at the end of a 120-kilometer (75-mile) swim. By the time he was released, he had grown to nearly three times his size when rescuers first picked him up. The rescue-and-release story is drawing attention as a reminder of how quickly coordinated wildlife care can change the fate of an animal in trouble. What happened? Accordi…