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Number of Blowholes: Toothed whales (like sperm whales, beluga whales, dolphins, etc.) have one blowhole. Baleen whales (like humpbacks, blue whales, gray whales, bowhead whales, etc.) have two blowholes, side by side.
Why do some whales have one blowhole and some have two?
Most mammals have two nostrils (blowhole equivalents). One of the nostrils (air-passages) of toothed whales evolved into their echolocation system (the sensing system in which they make and recieve high-pitched sounds in order to orient themselves, catch prey, and communicate), leaving them with only one blowhole.
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