Both whales and dolphins are cetaceans. One of the most notable differences between the two is the presence of teeth.
, or dolphin family. Members of this family include all dolphin species, as well as other larger species such as long-finned pilot whales and false killer whales, whose common names also contain ‘whale’ instead of ‘dolphin,’” wrote the NOAA Fisheries in aCollectively, both whales and dolphins, as well as their porpoise cousins, are known as cetaceans. Cetaceans are divided into two groups,the Whale and Dolphin Conservancy .
“The main differences with porpoises are that they are usually smaller than other toothed whales, and instead of cone-shaped teeth they have flat, spade-shaped teeth,” wrote WDC. “As a general rule of thumb, baleen whales are larger and slower than toothed whales. Additionally, all baleen whales have two blowholes, whereas toothed whales only have one.”
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