This Sept. 5, 2012 photo shows a worker at the Toba Aquarium in Toba, Japan, with a walrus during a show. After the show audience members are allowed to pet and have a picture taken with the animal. (AP Photo/Linda Lombardi)

This Sept. 5, 2012 photo shows Serena, a dugong at the Toba Aquarium in Toba, Japan. Dugongs, a sea mammal related to the manatee, are rare in captivity. The aquarium gift shop sells stuffed dugongs and dugong cookies. (AP Photo/Linda Lombardi)