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  • Tris Mamone wrote a new post, First live birth evidence in dinosaur relative 3 years, 7 months ago

    By Paul Rincon
    Scientists have uncovered the first evidence of live births in the group of animals that includes dinosaurs, crocodiles and birds.
    All examples of this group, known as the Archosauromorpha, lay […]

    • Live birth is not that hard to pull off. All you need is the eggs to hatch internally. Everything else can remain the same. There are some frogs that do it. Swordtail fish Xiphophorus helleri also do it.

    • Roedy #1
      Feb 17, 2017 at 3:57 am

      There are some frogs that do it.

      Frogs show a whole range of embryonic development, with eggs hatching in ponds, live tadpole births, live frog births, eggs and young incubated in the male’s mouth, eggs implanted under the skin in the backs of adults etc.

      Swordtail fish Xiphophorus helleri also do it.

      In fish egg-laying, mouth nursing, and live births are observed.

      In sharks, some species have internal development with sibling cannibalism, before the live birth of survivors!