Porpoise | Definition, Habitat, & Facts | Britannica
https://www.britannica.com/animal/porpoise
WEBporpoise, (family Phocoenidae), specifically, any of seven species of toothed whales distinguishable from dolphins by their more compact build, generally smaller size (maximum length about 2 metres, or 6.6 feet), and curved blunt snout with spatulate rather than conical teeth. In North America the name is sometimes applied to dolphins.
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