cetacean

US /sɪˈteɪ.ʃən/
UK /sɪˈteɪ.ʃən/
"cetacean" picture
1.

a marine mammal of the order Cetacea, including whales, dolphins, and porpoises.

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Whales and dolphins are examples of cetaceans.
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The study focused on the migration patterns of various cetacean species.
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whaledolphinporpoise