Search Results for: Vertebrates

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1,560 results

1,560 results for: Vertebrates

  1. Life

    News in brief: Fins to limbs with flip of genetic switch

    Boost of gene activity may help explain how arms and legs evolved in vertebrates.

    By Tina Hesman Saey
  2. Life

    Victorian zoological map redrawn

    Species distribution patterns that inspired Darwin and Wallace get an update.

    By Susan Milius
  3. Life

    Ancestors of today’s placental mammals may never have shared the Earth with dinosaurs

    A newly constructed family tree dovetails with the fossil record, but differs considerably from previous genetic studies by suggesting that placental mammals emerged after the dinosaur extinction.

    By Erin Wayman
  4. Life

    How mammals grow ears: With a flaw

    A newly discovered rupture-and-repair process that occurs in embryos could explain a lot about infections and hearing defects.

    By Susan Milius
  5. Life

    Dinosaur embryos were restless, speedy growers

    Hundreds of fossils found in China suggest some unhatched dinos kicked their legs.

    By Erin Wayman
  6. Life

    Coelacanth is not closest fishy relative of terrestrial animals

    Genes of “living fossil” do reveal changes needed to live on dry land.

    By Tina Hesman Saey
  7. Anthropology

    Evolutionary Back Story: Thoroughly modern spine supported human ancestor

    Bones from a spinal column discovered at a nearly 1.8-million-year-old site support the controversial possibility that ancient human ancestors spoke to one another.

    By Bruce Bower

  8. Blood Sucker: Like the adult heart, the developing heart takes advantage of suction

    The embryonic heart works more like the adult heart than scientists had long assumed.

    By Christen Brownlee

  9. Mammalian ear cells can regenerate

    The cells responsible for hearing in mammals may be capable of regeneration, just as those of birds and other vertebrates are.

    By Christen Brownlee
  10. Paleontology

    Sight for ‘Saur Eyes: T. rex vision was among nature’s best

    A study of dinosaur eyes finds that Tyrannosaurus rex had very sophisticated vision that may have helped its predatory abilities.

    By Eric Jaffe

  11. Air’s oxygen content constrains insect growth

    The size to which insects grow is limited by their need to route oxygen to tissues in their legs.

    By Ben Harder

  12. Quirky Cardiology: Crocs’ hearts may aid their digestion

    The crocodile's ability to direct oxygen-depleted blood to its stomach may be instrumental in digesting large, bony meals.

    By Ben Harder