Neotype skulls for Bigg's killer whale, Orcinus rectipinnus (left), and the resident killer whale, Orcinus ater (right). Bigg's killer whale skull is more robust and has a wider rostrum (beak), which are presumably adaptations for feeding on larger prey

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Neotype skulls for Bigg's killer whale, Orcinus rectipinnus (left), and the resident killer whale, Orcinus ater (right). Bigg's killer whale skull is more robust and has a wider rostrum (beak), which are presumably adaptations for feeding on larger prey

© NOAA Fisheries

Neotype skulls for Bigg's killer whale, Orcinus rectipinnus (left), and the resident killer whale, Orcinus ater (right). Bigg's killer whale skull is more robust and has a wider rostrum (beak), which are presumably adaptations for feeding on larger prey photo copyright NOAA Fisheries taken at and featuring the Environment class

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