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  2. Cetacea - Wikipedia

    en.wikipedia.org/wiki/Cetacea

    Female beaked whales' teeth are hidden in the gums and are not visible, and most male beaked whales have only two short tusks. Narwhals have vestigial teeth other than their tusk, which is present on males and 15% of females and has millions of nerves to sense water temperature, pressure and salinity.

  3. Whale - Wikipedia

    en.wikipedia.org/wiki/Whale

    Whales have two flippers on the front, and a tail fin. These flippers contain four digits. Although whales do not possess fully developed hind limbs, some, such as the sperm whale and bowhead whale, possess discrete rudimentary appendages, which may contain feet and digits.

  4. Evolution of cetaceans - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_cetaceans

    Modern baleen whales, Balaenopteridae (rorquals and humpback whale, Megaptera novaengliae), Balaenidae (right whales), Eschrichtiidae (gray whale, Eschrictius robustus), and Neobalaenidae (pygmy right whale, Caperea marginata) all have derived characteristics presently unknown in any cetothere and vice versa (such as a sagittal crest [42]). [43]

  5. Are whales mammals? Understanding the marine animal's ... - AOL

    www.aol.com/whales-mammals-understanding-marine...

    Humans have nostrils to breathe and so do whales. A whale's blowhole connects to its lungs to inhale oxygen. Some whales, such as the sperm or Cuvier's beaked, can spend over an hour between ...

  6. Baleen whale - Wikipedia

    en.wikipedia.org/wiki/Baleen_whale

    Baleen whales have two flippers on the front, near the head. Like all mammals, baleen whales breathe air and must surface periodically to do so. Their nostrils, or blowholes, are situated at the top of the cranium. Baleen whales have two blowholes, as opposed to toothed whales which have one.

  7. Beluga whale - Wikipedia

    en.wikipedia.org/wiki/Beluga_whale

    The beluga's body shape is stocky and fusiform (cone-shaped with the point facing backwards), and they frequently have folds of fat, particularly along the ventral surface. [38] Between 40% and 50% of their body weight is fat, which is a higher proportion than for cetaceans that do not inhabit the Arctic, where fat only represents 30% of body ...

  8. Comparative anatomy - Wikipedia

    en.wikipedia.org/wiki/Comparative_anatomy

    It also assists scientists in classifying organisms based on similar characteristics of their anatomical structures. A common example of comparative anatomy is the similar bone structures in forelimbs of cats, whales, bats, and humans. All of these appendages consist of the same basic parts; yet, they serve completely different functions.

  9. Beaked whale - Wikipedia

    en.wikipedia.org/wiki/Beaked_whale

    Beaked whales have several anatomical adaptations to deep diving: large spleens, livers, and body shape. Most cetaceans have small spleens. However, beaked whales have much larger spleens than delphinids, and may have larger livers, as well. These anatomical traits, which are important for filtering blood, could be adaptations to deep diving.