Cetacea
Cetacea is a widely distributed and diverse group of aquatic mammals that includes whales, dolphins, and porpoises. They are characterized by their streamlined bodies, paddle-shaped forelimbs, and lack of hind limbs. Cetaceans are highly adapted to their aquatic environment, with features such as a thick layer of blubber for insulation, a dorsal fin for stability, and a blowhole for breathing. They are also known for their complex social behaviors and communication, which often involve vocalizations such as songs and clicks. Cetaceans play an important ecological role as top predators in marine ecosystems, and are also of cultural and economic significance to many human societies.
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