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Embryogenesis of cetaceans (whales, dolphins, porpoises) is best known in Stenella attenuata, the pan‐tropical spotted dolphin, based on a remarkably complete and well‐studied prenatal ontogenetic series. Our study expands understanding of cetacean embryology by adding two additional cetacean taxa: the beluga whale (Delphinapterus leucas, Odontoceti), and the bowhead whale (Balaena mysticetus, Mysticeti)...