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Whales are marine mammals belonging to the cetacean group. This group includes many fish-like animals such as the baleen whale and the sperm whale. Dolphins and porpoises also belong to this group, though they are not whales.
Whales are not fishes, but mammals: they give live birth to their young and feed them with the mother's milk. The forelimbs of the whales are transformed into flippers, very similar to the fins of fish, which allows them to swim. Whales don't have gills, but lungs: they breathe air, just like us. The only nostril of the whale is positioned above its head, and it is called a blowhole. When a whale reaches the surface after a long dive, it blows air, carbon dioxide, and mucus out of its lungs, projecting many drops of liquid, like a kind of geyser. This has lead to the misunderstanding that whales blow water, or even vapor, through their blowhole.
Main species[edit | edit source]
- Baleen whales
- Sperm whale
- Beluga whale and narwhal
- Dolphins, including the killer whale
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