Researchers find 20,000-year-old refugium for orcas in the northern Pacific
Orcas in North Pacific. Credit: SDU/Olga Filatova The northern Pacific near Japan and Russia is home for several different groups of orcas. They have no contact with each other, do not seek the same food, do not speak the same dialect, and do not mate with each other. How can this be when they live so close to each other and belong to the same species?