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 Mit for short, one of two walrus calves separated from a herd in the Arctic Ocean and orphaned in Alaska in July. The Alaska SeaLife Center took them in and found new homes for each. (The other walrus, Pakak, went to the Indianapolis Zoo.) The New York Aquarium, eager for a young companion for its two older walruses, stepped up, flying a staff member, Martha Hiatt, to Alaska to work with Mit for a month.

On Oct. 11, Ms. Hiatt, the aquarium’s behavioral husbandry supervisor, along with a veterinarian, accompanied Mit on a FedEx cargo jet from Anchorage to Newark. The walrus, believed to be about 16 weeks old, stayed in his crate during the six-hour flight. “It was loud,” Ms. Hiatt said of the trip. “He pretty much sang to us the entire time. We stayed with him, talked to him and hosed him off now and then.”