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Who are you calling chicken? T. rex's closest living relative found on the farm
Scientists have at last uncovered the closest living relative of the mighty Tyrannosaurus rex, the most feared and famous of all the dinosaurs. For the first time, researchers have managed to sequence proteins from the long-extinct creature, leading them to the discovery that many of the molecules show a remarkable similarity to those of the humble chicken.
Originally posted by TheWalkingFox
I've actually read a few theories that state some predatory dinosaurs - the Carnosaurs, dromaeosaurs, and coelurosaurs, but not the Ceratosaurs or Coelophysoidea (including their descendants, the spinosaurs) - actually evolved from birds, and birds themselves originated in the late Triassic with the Eoraptors.
It certainly does explain a few aspects of therapod physiology that divides the one group from the other - The latter group had flexible tails, hanging arms, and long, straight necks, while the carnosaurs et al had stiffened tails, tucked forelimbs, and S-curved necks.
Take a look at therizinosaurs and maniraptors. The idea that birds evolved FROM these things is a little goofy... but the reverse isn't so terrible an idea - one needs only look at some creatures like diatryma to see the "huge hungry dino-bird" recurring in history.
Birds: Most successful vertebrate ever
Originally posted by Anubis_4400
they say that all dinos evolved into bird and that t-rexs closes relative today is the ostrich
Originally posted by MrAndy
I had always assumed though that they evolved to present day reptiles or amphibians? Don't they call Crocodiles the "living dinosaur"? I assume its because they are relatively unchanged from the Jurassic period, but why wouldn't they also have become poultry?
Originally posted by whargoul
You have to remember (and its a common misconception) dinosaurs were not reptiles.
Originally posted by roswell1
Originally posted by TheWalkingFox
I've actually read a few theories that state some predatory dinosaurs - the Carnosaurs, dromaeosaurs, and coelurosaurs, but not the Ceratosaurs or Coelophysoidea (including their descendants, the spinosaurs) - actually evolved from birds, and birds themselves originated in the late Triassic with the Eoraptors.
It certainly does explain a few aspects of therapod physiology that divides the one group from the other - The latter group had flexible tails, hanging arms, and long, straight necks, while the carnosaurs et al had stiffened tails, tucked forelimbs, and S-curved necks.
Take a look at therizinosaurs and maniraptors. The idea that birds evolved FROM these things is a little goofy... but the reverse isn't so terrible an idea - one needs only look at some creatures like diatryma to see the "huge hungry dino-bird" recurring in history.
Birds: Most successful vertebrate ever
uh.... can you put that in English?
There are plenty of birds thought to be far more primitive than chickens, including some that still have claws on their arms when they are young.
I like the theory that raptor type predators had the proto-feathers to keep their eggs warm. Then as they hunted and lept about into the air with their arms outstretched to pounce on prey they gradually leaped further and further, until the outstreatched arms became wings (on an evolutionary time scale). But really there is no way to prove this as fact, just sounds like a good theory to me.
Originally posted by TheWalkingFox
Originally posted by roswell1
Originally posted by TheWalkingFox
I've actually read a few theories that state some predatory dinosaurs - the Carnosaurs, dromaeosaurs, and coelurosaurs, but not the Ceratosaurs or Coelophysoidea (including their descendants, the spinosaurs) - actually evolved from birds, and birds themselves originated in the late Triassic with the Eoraptors.
It certainly does explain a few aspects of therapod physiology that divides the one group from the other - The latter group had flexible tails, hanging arms, and long, straight necks, while the carnosaurs et al had stiffened tails, tucked forelimbs, and S-curved necks.
Take a look at therizinosaurs and maniraptors. The idea that birds evolved FROM these things is a little goofy... but the reverse isn't so terrible an idea - one needs only look at some creatures like diatryma to see the "huge hungry dino-bird" recurring in history.
Birds: Most successful vertebrate ever
uh.... can you put that in English?
Sure.
Some sorts of predatory dinosaurs may have in fact evolved from birds, rather than the other way around.
Take the dromaeosaurs, the "raptors" - Notice their body structure. Their forelimbs are tucked under their chest, their necks have an S-shaped curve, and their tails held out stiff behind them. These are traits found also on the Carnosaurs (T. rex), and Coelurosaurs (Compsugnathus). They are also found on birds. Now it'd be a hard argument to say Tyrannosaurs turned into birds, along with Dromaeosaurs, etc. However, positing that these three dinosaur groups, and birds, all shared a common, and very birdlike ancestor is quite possible
Originally posted by crowpruitt
I think that i read or heard somewhere that raptors also evolved into birds.Now I could be wrong but i swear i heard this before somewhere.Anyone else hear of this?