Cetaceans
Cetaceans are a group of marine mammals that includes whales, dolphins, and porpoises. They are characterized by their streamlined bodies, which are adapted for swimming in water, and their blowholes, which they use to breathe air at the surface. Cetaceans are found in all of the world's oceans, as well as in some rivers and estuaries. They are highly intelligent and social animals, with complex communication systems and behaviors. Some species of cetaceans are endangered due to hunting, pollution, and habitat loss.
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