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adam unikowski

NOVA | The Four-Winged Dinosaur - 0 views

www.pbs.org/...four-winged-dinosaur.html

nova dinosaur anthropology

shared by adam unikowski on 08 Dec 11 - No Cached
  • n 2002
  • In 2002
  • the 130 million-year-old creature
  • ...13 more annotations...
  • debate over the origin of flight
  • Or were the extra wings useless for flight and likely to have been for some other purpose, such as attracting a mate?
  • Dubbed Microraptor, the crow-sized fossil is one of the smallest dinosaurs ever found
  • Did it array its arm- and leg-mounted wings in the style of an early 20th-century biplane to produce high lift at low speed?
  • Did it use them to create a single lifting surface for efficient, swift gliding?
  • Chinese stone quarry where the fossil was discovered
  • Artists have historically played an important role in paleontology by helping to reconstruct the appearance and behavior of ancient animals.
  • For years the debate has been a standoff between two camps—those who believe dinosaurs were the ancestors of birds, and those who do not.
  • Believers in the dinosaur-bird connection have generally assumed that flight must have begun from the ground up, with fast-running dinosaurs that eventually got airborne as feathered arms evolved into wings,
  • Skeptics of the bird-dinosaur link say it would have been physically impossible for running dinosaurs to overcome gravity and get off the ground.
  • Larry Martin
  • speaks out for the minority view that birds descended from non-dinosaur tree dwellers.
  • Microraptor is the unexpected missing link that has reignited the debate
  • adam unikowski on 08 Dec 11
     
    This very interesting because it shows how people though that birds are decedents of dinosaurs. Then there are the non believers that do not believe that dinosaurs were the ancestors of birds. The four winged dinosaur Microraptor had brought up this debate again. Microraptor is the missing link that reignited this debate. This website is credible because at the bottom of the page it gives the name of the man who made the site and it is part of pbs.
adam unikowski

Four-Winged Dinosaurs Found in China, Experts Announce - 0 views

news.nationalgeographic.com/...0121_030122_dromaeosaur.html

nova dinosaurs experts dinosaur anthropology

shared by adam unikowski on 14 Dec 11 - No Cached
  • bipedal carnivorous dinosaurs called theropods
    • adam unikowski
      adam unikowski on 14 Dec 11
       
      The theropod (meaning "beast-footed") dinosaurs are a diverse group of bipedal saurischian dinosaurs. 
  • fully developed, modern feathers on both the forelimbs and hind limbs.
  • The six specimens were excavated from the rich fossil beds of Liaoning Province in northeastern China
  • ...7 more annotations...
  • How did a group of ground-dwelling flightless dinosaurs evolve to a feathered animal capable of flying?
  • used its feathered limbs, along with a long, feather-fringed tail, to glide from tree to tree.
  • new species, Microraptor gui
  • dated at between 128 to 124 million
  • four feathered limbs,
  • birds are most closely related to dromaeosaurids
  • dromaeosaurs were small, feathered animals with forelimbs similar to those of Archaeopteryx, the oldest known bird at around 150 million years old, and feet with features comparable to modern tree-living birds.
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