Reanalysis of Four-Winged Dinosaur May Illuminate Evolution of Bird Flight

Oct 23, 2012 | Posted by: roboblogger | Full story: Scientific American

How did the ancestors of birds evolve the ability to fly? That birds are descended from small, meat-eating dinosaurs is established.

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coelophyis

Durham, NC

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#1
Oct 24, 2012
 
microraptor is not a dinosaurs its a bird archaeoteryx was before microraptor and dinosaurs can not climb tree and have bad arm movement the best was heavy heavy tail allosaurus yes dinosaurs are alive they call aligator.and were heavyly armo skin like ground reptile they did not evolve smood skin like there tree climbing cousin the lizard
Edaphosaurus

Edinburgh, UK

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#2
Oct 24, 2012
 
Yes but microraptor's relatives evolved into archaeopteryx and microraptor's relatives evolved from dinosaurs like Eoraptor
coelophyis

Durham, NC

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#3
Oct 25, 2012
 
eoraptor and herrerasaurus had 5 finger no furcula very heavy lots of archosaur feature first bird like dinosaurs 4 finger coelophyis no fuse furcula a prehistoric reptilian feature found other reptile like lizard not modern birds archaeoteryx coelophyis type of dinosaurs like t.rex. allosaurus .protoavis bird was before coelophyis .eoraptor herrerasaurus coelophyis haD BAD ARM MOVEment they could not climb trees flight came from the tree that why croc dino look like tuatara ancestor . there is no evidence dinosaurs had 3 finger fuse furcula before coelophyis
coelophyis

Durham, NC

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#4
Oct 25, 2012
 
coelophyis probly had more of reptilian brain archosaur like not like modern croc and like dino like allosaurus t.rex. carnotaurus that had more of modern croc brain in the allosaurus family group the giant argentine predator dinosaurs had a archosaur type of brain a primtive feature. eoraptor is link with coelophyis spinosaurus by skull but not allosaurus type of dinosaurs .plus there is perching bird foot print fossil in coelophyis time bird was allready flying in that time.and lizard are more close to bird by evolution tree climbing skills and smood skin than dino. only link dinosaurs have with alive animal is the aligator which they are same animal and there distance reltive crocdilyform the none sensory dot skin form of crocs that had its claws on all toes and no bony palates dinosaurs had all these feature
JMD577

Saint Paul, MN

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#5
Oct 25, 2012
 
one word: evolution. The earliest dinosaurs evolved from reptiles such as crocodillians (which I'm assuming is why you say alligators are dinosaurs) and the number of claws were a leftover. They soon grew upright, produced 3 claws, and off we go on our journey to birds.(Which is also a dinosaur, therefore.) So dinosaurs were crocs, and birds are dinosaurs. Case settled?
coelophyis

Durham, NC

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#6
Oct 25, 2012
 
modern crocodilian ancestor is spinosauridae.modern bird archaoeteryx bird maniraptorian birds skull body brain claws finger skin teeth teeth replacement and way they walk are differant from coelophyis type of dinosaurs. dinosaurs walk like human with very moveble femur bird femur is fix they are knee runners the tibia is the femur the tibia is the ankle. all dinosaurs group from bird hip lizard hip are found with armo back 2 rows or more for thermoregulation a very reptilian feature and primtive feature you can see in primtive reptile like the tuatara with croc bums dino iguana turtle like spine early lizard tree climbing lizard like iguana chameleon are missing there croc bums
JMD577

Saint Paul, MN

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#7
Oct 25, 2012
 
Actually, you've got the wrong adress. All Crocodilia have an ancestor in Neosuchia, until you climb up the stairs all the way to where the main branch begins. Take the hallway Left, make a left turn, and you're in Archosauria's office, where Crocs and dinosaurs are brothers and sisters. Now if we made a hallway connecting to the dinosaurs' offices, then we'd agree with your theories most entirely.
coelophyis

Durham, NC

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#8
Oct 25, 2012
 
you did not read my full post on dinosaurs home jmd crocodilyform croc date 240-250 millon years ago did turn into dinosaurs all scienttist agree to that me too but they did not turn into modern crocodilians date 150 millon years ago like gharial aligator crocodile. dinosaurs is the won that turn into modern crocodilians . bird fingers claws 2,3,4, dinosaurs claws finger 1,2,3, like modern crocs but they have five finger missing finger claws 4,5, and missing toes 5, and have 4 toes. and missing toe claws 4
coelophyis

Durham, NC

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#9
Oct 25, 2012
 
that make aligator a dinosaurs odd looking thou its a aquatic form of dinosaurs it share most of feature of dinosaurs sensory dot skin the skull bony palates teeth nose above the eyes a spinosauridae dino feature crocodilyforum crocs the land crocs that could not sprawl did not have these feature or any evidence of aquaticness the candidate that some scientist claim to turn into modern crocodilian date 155 millon years ago had 5 claws on both legs nose below the eyes its a mammal like feature other won with the same design date 185 millon years ago only had 4 toes on both legs 4 claws both leg ball socket leg mammal like feature these crocs were dino dinner dinosaurs got rid of them
coelophyis

Durham, NC

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#10
Oct 25, 2012
 
these crocodile missing claws are not use for grip is for assit in jumping out water or jumping in water for speed to catch prey in shallow water prehistoric modern croc catcroc about 100 millon years ago had 5 claws on finger they think it mostly live on land these crocs had long legs only use high walk not like today modern crocs. mostly prehistoric modern crocs had 3 finger claws even only on land lifestyle some had 4 toe claws all have bony palates a aquatic feature not like crocodilyform croc the land crocs. you see these croc were differant from land crocs crocodilyform they also had crocodile tail it allso work well on land so they keep it won them even had a bobtail.
coelophyis

Durham, NC

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#11
Oct 25, 2012
 
there is no simi aquatic animal or land animal that when into water with that claw design like modern crocodilian its aquatic design they are many simi aquatic lizard and they do not have that design they learn it from the water from evolve from spinosauridae water monitor lifestyle animal at home on land and water it had giant first finger claw like megaraptor another aquatic water monitor dinosaurs carnotaurus has no finger claw reduse claws is modern crocodilian feature both probly hunted like house cat with crouching attack walking on 4 leg small powerful arm then get up with bipedal attack assit in hunting like today modern crocs all thou they could not rotate there arms
coelophyis

Durham, NC

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#12
Oct 25, 2012
 
allthou look like theropod dinosaurs is walking on four legs most weight is on back leg they keep there arms to the side movement like swiming by crouching fossil foot print really is new design for walking like today crocs they are not really walking like 4 leg animals they probly were very fast like today crocs when hunting spinosauridae could not reduce its claw or finger like t.rex carnotaurus because they use arm head for hunting a early dinosaurs feature t.rex. carnotaurus only use there head and t.rex. was only a land animal t.rex reduse finger was for more speed carnotaurus has 4 finger but design is like t.rex. the finger are fuse it looks like 2 fingers like the chameleon
coelophyis

Durham, NC

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#13
Oct 25, 2012
 
carnotaurus was just at hame on land like t.rex. probly was even faster than t.rex. in the crouching attack with 4 finger i guest when use that attack like a house cat house cat not allways use that attack that how you know this animal had a water monitor lifestyle not lifestyle like today simi aquatic crocs . modern crocs ankle is differant from dinosaurs and way they walk dinosaurs walk like humans but croc evolve in the water did not need bipedal to abush prey like mammal and like fish probly first modern crocodilian is the gharial that could not sprawl or do the high walk like other modern crocodilian like aligator crocodile crocodilyforum crocs can do the high walk but not the sprawling
coelophyis

Durham, NC

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#14
Oct 25, 2012
 
gharial only eat fish the high walk crocodilyform crocs and modern crocodilian share is convergent evolution like some modern crocs had long legs and grow back all there claws reason all 23 species 3 type of crocs modern crocs still have 3 finger small arms and look the same because its successful you can see prehistoric modern crocs were diverse and sheildcroc had frill dinosaurs skin a dinosaurs feature some even had serrated edge teeth armo foot of course duckcroc mammal like mouth . teeth replacement were like dinosaurs you see modern crocs show they were dinosaurs and can explain how happen and are just simi aquatic dinosaurs simple it can back it up by science
coelophyis

Durham, NC

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#15
Oct 25, 2012
 
again sensory dot skin is a modern crocodilian feature .they found compsogthus type dinosaurs with a hepatic piston a modern crocodilian feature and a diaghragm a modern crocodilian feature mammal have a diaghragm too but not a hepatic piston birds do not have hepatic piston and diaghragm.boo boo still have 3 finger still have 3 finger claws
Edaphosaurus

Edinburgh, UK

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#16
Oct 26, 2012
 
Look JMD, Coe is a BANDit, a mislead person who believes that birds are not dinosaurs. Seeing as he writes so much trash which no one can be bothered to read it is best if we ignore him and let him stew in his own juices. Come to Imperial Palace JMD, there are Trolls or Bandits and only minor fanboys
JMD577

Saint Paul, MN

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#17
Oct 26, 2012
 
I've got my own IP, and I think my friend here should be able to talk about his theories with us.
coelophyis

Durham, NC

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#18
Oct 27, 2012
 
i see evidence has hit a nerve its not my evidence you can not run away from the evidence even a amature can see there is no bird link like my self. bandit even them has misslead public not as bad as the cult bad some bandit lieing saying dinosaurs are dead spinosaurus fossil has been around for years superfacil clearly look like a modern croc and clearly its not modern croc its true coelophyis type of dinosaurs its just coelophyis type dino with crocodile skull on top its body bad did a good job keep it other the rug for years so they can keep there fantasy bird link going some bandit its just ego no won wants to be wrong but in this case keep media carrera going
coelophyis

Durham, NC

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#19
Oct 27, 2012
 
on these bad web site they do not want to here the evidence because they know they have no evidence then they kick you out i have been kick out lot of them they do not want to debate science is all about both sides they are not really fair as scientist should be the media should know that they have agender as a former bad i beleave every thing they said because they were a scientist i thought they were fair. the evidence came out of blue by accident any way media allways have agender bad is the king of ignore evidence .i have no problem flip flop give me evidence i do it my evidence is not trash many scientist agree with me not every scientist beleave bird are dinosaurus and science is not popularity contest its all about evidence not propoganda
coelophyis

Durham, NC

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#20
Oct 27, 2012
 
aligator is a dinosaurs just like a sea turtle is a turtle and tortoise. a full blooded dinosaurs. they know about gator fingers claws for years . as for the media i understand they are a business

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