Narwhals and beluga whales can mate and produce hybrid offspring called narlugas. Scientists confirmed the first known specimen in 2019 by sequencing a skull obtained from an Inuk hunter in Greenland, revealing that its mother was a narwhal and its father was a beluga. The hybrid had 18 spiraled teeth and apparently fed along the seafloor. Researchers suspect that narlugas themselves are probably infertile.
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