Cetacean
A member of the mammalian order Cetacea, which includes whales, dolphins, and porpoises. Cetaceans are fully aquatic mammals adapted to life in water.
Mysticeti: The cetacean suborder of baleen whales, which filter-feed using keratinous plates. This lineage includes the largest cetaceans and feeds without functional teeth.
Cetacean evolution: The evolutionary history through which land-dwelling mammals became fully aquatic cetaceans. It explains how terrestrial anatomy was transformed for life in water.
Cetacean conservation: The protection and management of cetacean species and their habitats. Many populations face threats that require coordinated conservation measures.
Whale: A common name for large cetaceans, including baleen whales and some toothed whales. Whales are cetaceans, but the everyday label does not map neatly onto a single lineage.
Pakicetus: An early Eocene mammal from South Asia, among the earliest known cetaceans. Its fossil anatomy links early cetaceans to land-dwelling ancestors.
Odontoceti: The cetacean suborder of toothed whales, dolphins, and porpoises. Its members retain teeth and include most living cetacean species.
Cetacean locomotion: The swimming movements and anatomical adaptations that propel cetaceans through water. Horizontal tail flukes and flexible bodies generate their characteristic propulsion.
Whaling: The hunting of whales for meat, oil, and other products. Commercial whaling sharply reduced some cetacean populations and remains regulated internationally.
Dolphin: A common name for several groups of small or medium-sized toothed cetaceans. Dolphins are toothed cetaceans, distinct from baleen whales and porpoises.
Ambulocetus: An early cetacean from the Eocene of Pakistan, adapted for movement in water and on land. Its anatomy illustrates an intermediate stage in cetacean aquatic adaptation.