Cetacean
Cetacean
Cetacean (pronunciation: /sɪˈteɪ.ʃən/) is a term used to describe a group of aquatic mammals that includes whales, dolphins, and porpoises. The term is derived from the Latin word cetus, meaning "large sea animal", and the Greek word ketos, which also means "sea monster".
Etymology
The term "Cetacean" is derived from the Latin cetus and the Ancient Greek κῆτος (kētos), both meaning "large sea animal" or "sea monster". The term was first used in the early 19th century to classify these aquatic mammals.
Classification
Cetaceans are divided into two suborders: Mysticeti (baleen whales) and Odontoceti (toothed whales). The Mysticeti include species like the blue whale and the humpback whale, while the Odontoceti include species like the sperm whale, dolphins, and porpoises.
Anatomy
Cetaceans have a streamlined body designed for fast swimming. They have a layer of blubber under the skin to keep warm in the cold water. They breathe through a blowhole on top of their head. All cetaceans have forelimbs modified into flippers, a tail with horizontal flukes, and vestigial hind limbs.
Behavior
Cetaceans are known for their intelligence and complex social structures. Some species, like dolphins, are known for their playful behavior. They communicate using a series of clicks, whistles, and body movements.
Conservation
Many cetacean species are threatened by human activities such as hunting, fishing, and habitat destruction. Conservation efforts are in place to protect these species and their habitats.
Related Terms
External links
- Medical encyclopedia article on Cetacean
- Wikipedia's article - Cetacean
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