A team of 15 is caring for him around the clock. His favorite toy is a plastic bucket. He has taken swimmingly to a large pool. And on Friday, he had his first taste of solid food — surf clams. “He’s hitting every milestone we’re hoping to see,” said Jon Forrest Dohlin, director of the New York Aquarium in Coney Island, Brooklyn, part of the Wildlife Conservation Society. “He still has some issues with his bladder, but they are trending in the right direction. Behaviorally, he’s doing great and we’re feeling good about his progress.” He was describing Mitik, or...