A recent paper, led by authors from the Southwest Fisheries Science Center, indicates that there are multiple species of Orca (killer whale). The paper "Complete mitochondrial genome phylogeographic analysis of killer whales (Orcinus orca) indicates multiple species" describes sympatric ‘ecotypes’ with discrete prey preferences, morphology and behaviors. The study found that differing ecotypes avoid social interactions and are not known to interbreed.
Source: NOAA
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