J.J. is a gray whale (Eschrichtius robustus) who was found beached in Marina del Rey, California on January 10th, 1997 where she was rushed to SeaWorld San Diego. After 14 months, she was released because she also grew too large to be cared for in the existing facilities. At 19,200 pounds (8,700 kg) and 31 feet (9.4 m) when she was released, J.J. was the largest marine mammal ever to be kept in captivity.