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  2. Dugong - Wikipedia

    en.wikipedia.org/wiki/Dugong

    The dugong (/ ˈ d (j) uː ɡ ɒ ŋ /; Dugong dugon) is a marine mammal.It is one of four living species of the order Sirenia, which also includes three species of manatees.It is the only living representative of the once-diverse family Dugongidae; its closest modern relative, Steller's sea cow (Hydrodamalis gigas), was hunted to extinction in the 18th century.

  3. Metaxytherium - Wikipedia

    en.wikipedia.org/wiki/Metaxytherium

    Metaxytherium is an extinct genus of dugong that lived from the Oligocene until the end of the Pliocene. Fossil remains have been found in Africa , Europe , North America and South America . Generally marine seagrass specialists, they inhabited the warm and shallow waters of the Paratethys , Mediterranean , Caribbean Sea and Pacific coastline.

  4. Sirenia - Wikipedia

    en.wikipedia.org/wiki/Sirenia

    Unlike those of manatees, the dugong's teeth do not continually grow back via horizontal tooth replacement. [38] The dugong has two tusks which emerge in males during puberty, and sometime later in life for females after reaching the base of the premaxilla. [33] The number of growth layer groups in a tusk indicates the age of a dugong. [39]

  5. Prehistoric sea cow was eaten by a croc and a shark, newly ...

    www.aol.com/news/prehistoric-sea-cow-eaten-croc...

    A fossil reveals how a now-extinct species of dugong was swimming in the sea about 15 million years ago when it was preyed upon by a crocodile and a tiger shark.

  6. Marine mammal - Wikipedia

    en.wikipedia.org/wiki/Marine_mammal

    In contrast, other marine mammals—such as whales, dolphins, porpoises, manatees, dugongs, and walruses—have lost long fur in favor of a thick, dense epidermis and a thickened fat layer (blubber) to prevent drag. Wading and bottom-feeding animals (such as manatees) need to be heavier than water in order to keep contact with the floor or to ...

  7. Physiology of underwater diving - Wikipedia

    en.wikipedia.org/wiki/Physiology_of_underwater...

    The physiology of underwater diving is the physiological adaptations to diving of air-breathing vertebrates that have returned to the ocean from terrestrial lineages. They are a diverse group that include sea snakes, sea turtles, the marine iguana, saltwater crocodiles, penguins, pinnipeds, cetaceans, sea otters, manatees and dugongs.

  8. Evolution of sirenians - Wikipedia

    en.wikipedia.org/wiki/Evolution_of_sirenians

    Although cheek teeth are relied on for identifying species in other mammals, they do not vary to a significant degree among sirenians in their morphology, but are almost always low-crowned (brachyodont) with two rows of large, rounded cusps (bunobilophodont). The most easily identifiable parts of sirenian skeletons are the skull and mandible ...

  9. Mammals of Australia - Wikipedia

    en.wikipedia.org/wiki/Mammals_of_Australia

    The dugong (order Sirenia) is an endangered marine species that inhabits the waters of northeastern and northwestern Australia, particularly the Torres Strait. It can grow up to 3 metres (9.8 ft) long and weigh as much as 400 kilograms (880 lb). The dugong is the only herbivorous marine mammal in Australia, feeding on sea grass in coastal areas.