Dorsal Fin | Animal Appendage | Britannica

Home » What Is The Dorsal Fin » Dorsal Fin | Animal Appendage | Britannica

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cetaceans

  • species of whales In cetacean: Locomotor adaptations

    …almost all cetaceans possess a dorsal fin that serves as a keel. The dorsal fin and flukes are composed of connective tissue, not bone. Other connective tissue, such as external ears, has been lost, and the male genitalia have moved internally.

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killer whales

  • orca In killer whale: Natural history

    The dorsal fin of older males is very tall (up to 1.8 metres [5.9 feet]) and straight; females and young males have a dorsal fin that is about half that size and distinctly sickle-shaped (falcate). The skull is a metre or more in length and holds…

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