Experts believe birds are living dinosaurs - Deepstash

Experts believe birds are living dinosaurs

Fossils reveal that some of the more advanced dinosaurs had feathers or featherlike body covering.

  • Archaeopteryx was considered the first bird but probably couldn't fly far.
  • Pterosaurs - extinct flying reptiles - were not dinosaurs although they were close relatives of dinosaurs. They had hollow bones, relatively large brains and eyes, and skin flaps extended along their arms.

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MORE IDEAS FROM A Brief History of Dinosaurs

Well-known dinosaurs like the Tyrannosaurus rex, Deinonychus and Velociraptor fall into this order. Saurischians are divided into two groups.

  • Sauropods are four-legged herbivores. They had long heads, long necks and long tails. Leaf-eating Apatosaurus, Brachiosaurus and Diplodocus fall into this family.
  • Theropods are two-legged carnivores. There are some of the most fearsome dinosaurs, including Allosaurus and T. rex.

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In 2017, a study suggested that this hip-oriented classification was incorrect.

Theropods are likely related to the ornithischian dinosaurs. The theropods and Ornithischia form a newly identified group known as Ornithoscelida. If this is correct, it may explain why both theropods and Ornithischia have feathers, while other dinosaurs don't.

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Dinosaurs ruled the Earth for 175 million years

Dinosaurs first appeared between 247 and 240 million years ago. An extinction event wiped them out 65,5 million years ago, except for the avian dinosaurs.

Scientists think the extinction was likely because of an asteroid impact, chemicals from erupting volcanoes, climate change and other factors.

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In 1842, palaeontologist Richard Owen coined the term dinosaur. The Greek deinos means "terrible," and sauros means "lizard" or "reptile."

Based on the structure of the hipbones, dinosaurs are classified into two orders:

  • Saurischians. These "reptile-hipped" dinosaurs have a pelvis that points forward. They are often long-necked, have large and sharp teeth, long second fingers, and a first finger that point away from the rest of the fingers.
  • Ornithischians are beaked herbivores and milder.

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Ornithischians include horned and frilled Triceratops, spiked Stegosaurus and armoured Ankylosaurus.

They often lived in herds and were prey to the larger species of dinosaurs.

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RELATED IDEA

The ABCs Of DNA

Your DNA is different from everyone else’s. It determines many of the characteristics that define you, like the color of your eyes or whether your hair is straight or curly.

DNA is much easier to find in the “soft parts” of an animal – their organs, blood vessels, nerves, muscle and fat.

But a dinosaur’s soft parts are long gone. They either decomposed or were eaten by another dinosaur.

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Plausibility of Jurassic Park

In 1993, Newsweek ran an article affirming the scientific plausibility of Jurassic Park. They pointed out that two Berkeley scientists announced that they had cloned 40m-year-old bee DNA after finding the insect preserved in amber.

But to replicate a dinosaur genome, you would need billions of DNA building blocks. They could not harvest more than 250. Moreover, the amber-based experiments of the bee DNA finding were likely based on false results. Lastly, no one has ever found any dinosaur DNA since DNA degrades over time.

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Knowing how dinosaurs look

Nobody today has ever seen a dinosaur in real life. We may have seen museum models and illustrations, but we don't know if dinosaurs really looked like that.

The best skeletons are only 90% complete, and even specialists called paleoartists have to make informed guesses.

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