Cetacean is the collective noun used to describe all 90 species of whales, dolphins and porpoises.
The word cetacean has its origins in Latin (Cetus) referring to a large sea creature and Greek (Ketos) meaning whale or sea monster.
Having evolved around 50 million years ago, today they are separated into two distinct types - Mysticeti (baleen whales) and Odonotoceti (toothed whales).
What are the differences between whales, dolphins and porpoises?
From the enormous blue whale to the tiny vaquita, they share many characteristics but also have some distinctive features which set them apart.
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