Moby Doll was the first orca (killer whale) to survive in captivity for more than two days, and the second to be displayed in a public aquarium exhibit. The availability, for the first time, of a killer whale that could be studied at close quarters alive initiated pioneering research. From a recording of Moby Doll's calls, he was years later identified as a member of J Pod of the Southern Residents, the population of orcas most damaged by subsequent captures.