Barbarian
Member
- Jun 5, 2003
- 33,205
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Barbarian observes:
By definition, they are reptiles. Aminiotes with multiple bones in their lower jaws. They just have a few transitional features.
Herptology. The people who study reptiles.
Async gives us his definition:
So a guppy is a reptile by your definition. Nice going.
The reason scientists use the jaw as a defining feature, is that it is one of the few clear differences between reptiles and mammals.
...if they are right, then guppies are reptiles. Good going. Maybe you'd be better off using science, instead of Ask.com or whatever. Or at least check your information with a knowledgeable source.
Barbarian observes:
Wrong. The evidence shows that wings were first used for maneuvering during running.
We see in in small theropod dinosaurs, for example, and in flightless birds like ostriches.
Running dinosaurs.
But the shoulder joints of those running dinosaurs were fine for flying...
When describing specimens originally referred to the distinct species Cryptovolans pauli, paleontologist Stephen Czerkas argued that Microraptor may have been able to fly better than Archaeopteryx, noting the fused sternum and asymmetrical feathers of Microraptor, as well as features of the shoulder girdle that indicate flying ability closer to modern birds than to Archaeopteryx.
http://en.wikipedia.org/wiki/Microraptor
Fused sternum, flight featheres, shoulder that permitted free movement upward. Things like that. BTW, Archaeopteryx didn't have a shoulder girdle that permitted such movement.
Xing Xu and his colleagues at the Chinese Academy of Sciences in Beijing said that their examination of Xiaotingia, in comparison with more recognizably bird skeletons from the same period as well as the 150-million-year-old Archaeopteryx, showed that the new fossils fell short of a place in the avian family. Several of its anatomical traits, like the long and robust forelimbs once thought to be diagnostic of birds, were actually common to a group of dinosaurs known as deinonychosaurs.
You problably missed it. Go back and you'll learn that it was an adaptation of existing movement used by running dinosaurs.
The existence of asymmetrical flight feathers shows that they did fly.
Show us the evidence for that. I'll be asking again, if you forget.
Barbarian observes:
More likely, they used them they way ostriches and other flightless birds do; as means of maneuvering on the ground, or to make longer jumps or land more softly.
All of which is transitional to flight, using the same structures and movements.
Dinosaurs and earlier reptiles had been doing that for about 80 million years.
Same motions as flight. Which is a pretty good clue in itself.
But small, feathered dinosaurs with pre-existing wings and feathers would have a pretty easy time of it.
As you learned, brain power has little to do with it.
As you see, the motions and structure used by bird for flight were already present and being used for other purposes before there were birds.
You just learned better.
But another interesting question appears.
Don't see a problem with that.
See above.:biglol
You've been misled about that, too. They use the entire arm.
http://www.youtube.com/watch?v=BwBjTFTlFvI
Facts once again tripped you up, I see. Check your facts, and it won't happen so often.
They are highly evolved, but some distant relatives (the sunbirds) have some species that also hover and take nectar as the hummingbirds do.
So they aren't out of nowhere.
And a few more times, reality catches you unawares.
DNA analysis shows they have a common ancestor with the swifts and are distantly related to the passerines.
You were surprised to find that the evidence shows an origin in the insectivores.
You were a bit taken back when you learned that humans can echolocate too, and sometimes do.
Barbarian chuckles:
Show us that. Sounds interesting.
So you have no evidence for your claim that it couldn't evolve, you just hope we believe it? O.K.
Meantime, here's some of the evidence for endothermic dinosaurs. Haversian canals, high metabolic output, running and flying, insulation on bodies, etc. Even many creationists admit it.
The primary use of feathers in birds is for warmth and display. Many of them can also fly, but that's not the first use. Dinosaurs had feathers long before any of them could fly.
Microraptor and Archaeopteryx could fly a little.
Remember, flight uses the same movements and structures used by small theropods in running. As usual, something already there, modified to a new use.
Microraptor's shoulder joint allowed an upward reach needed for a strong wing movement. No point in denying it.
I'm sympathetic to your issue about evidence. But denying it won't help you. Learn more about the subject and you'll do better.
By definition, they are reptiles. Aminiotes with multiple bones in their lower jaws. They just have a few transitional features.
Mistake. I don't know where you get that definition, but:
Herptology. The people who study reptiles.
Async gives us his definition:
A reptile is any cold blooded, scaly animal that (generally) produce their young in the form of an egg.
So a guppy is a reptile by your definition. Nice going.
The reason scientists use the jaw as a defining feature, is that it is one of the few clear differences between reptiles and mammals.
etc etc. They clearlyknow more about this than you do, so...
...if they are right, then guppies are reptiles. Good going. Maybe you'd be better off using science, instead of Ask.com or whatever. Or at least check your information with a knowledgeable source.
Barbarian observes:
Wrong. The evidence shows that wings were first used for maneuvering during running.
There is, and can be no such evidence.
We see in in small theropod dinosaurs, for example, and in flightless birds like ostriches.
As you just learned, the instincts were already there.
And where did they come from?
Running dinosaurs.
But the shoulder joints of those running dinosaurs were fine for flying...
When describing specimens originally referred to the distinct species Cryptovolans pauli, paleontologist Stephen Czerkas argued that Microraptor may have been able to fly better than Archaeopteryx, noting the fused sternum and asymmetrical feathers of Microraptor, as well as features of the shoulder girdle that indicate flying ability closer to modern birds than to Archaeopteryx.
http://en.wikipedia.org/wiki/Microraptor
Tripe. What features?
Fused sternum, flight featheres, shoulder that permitted free movement upward. Things like that. BTW, Archaeopteryx didn't have a shoulder girdle that permitted such movement.
Xing Xu and his colleagues at the Chinese Academy of Sciences in Beijing said that their examination of Xiaotingia, in comparison with more recognizably bird skeletons from the same period as well as the 150-million-year-old Archaeopteryx, showed that the new fossils fell short of a place in the avian family. Several of its anatomical traits, like the long and robust forelimbs once thought to be diagnostic of birds, were actually common to a group of dinosaurs known as deinonychosaurs.
We still haven't heard from you about the origin of the flight instincts.
You problably missed it. Go back and you'll learn that it was an adaptation of existing movement used by running dinosaurs.
I'm not in the slightest bit surprised. There is no evidence whatsoever that these crearures flew - and if they did, where did the flight instinct come from?
The existence of asymmetrical flight feathers shows that they did fly.
I'm afraid it doesn't. These critters ,probably forgeries
Show us the evidence for that. I'll be asking again, if you forget.
Barbarian observes:
More likely, they used them they way ostriches and other flightless birds do; as means of maneuvering on the ground, or to make longer jumps or land more softly.
None of which is flight
All of which is transitional to flight, using the same structures and movements.
and another question now arises - where did they get their running and jumping instincts from?
Dinosaurs and earlier reptiles had been doing that for about 80 million years.
Same motions as flight. Which is a pretty good clue in itself.
You and your descendants can wave your forelimbs in the air till the cows come home, and you will never evolve a feather, a wing, or be able to fly.
But small, feathered dinosaurs with pre-existing wings and feathers would have a pretty easy time of it.
Why should you supose a reptile had more brain power than you do?
As you learned, brain power has little to do with it.
As you see, the motions and structure used by bird for flight were already present and being used for other purposes before there were birds.
No, I don't see that Flying is an advanced skill, which no reptile could possess.
You just learned better.
But another interesting question appears.
Humming birds do not fly with their arms as all other birde do. They fly with their HANDS, the rest of the arm structure being INSIDE the body.
Don't see a problem with that.
Now you are already struggling with getting a reptile airborne using the whole of the forelimb structure.
See above.:biglol
Get the humming bird airborne, using its hands - like the bats.
You've been misled about that, too. They use the entire arm.
http://www.youtube.com/watch?v=BwBjTFTlFvI
It's amazing how a little bird can destroy such a large theory. Facts, you see.
Facts once again tripped you up, I see. Check your facts, and it won't happen so often.
They come from nowhere: these most advanced fliers in the bird kingdom.
They are highly evolved, but some distant relatives (the sunbirds) have some species that also hover and take nectar as the hummingbirds do.
So they aren't out of nowhere.
So that's the end of this birds evolved from reptiles, nonsense.
And a few more times, reality catches you unawares.
Which reptile do you propose as the most likely candidate for H-B ancestry? Have a guess
DNA analysis shows they have a common ancestor with the swifts and are distantly related to the passerines.
You couldn't meet the challenge of the origin of the bats
You were surprised to find that the evidence shows an origin in the insectivores.
who also fly with their hands, and echolocate.
You were a bit taken back when you learned that humans can echolocate too, and sometimes do.
Now try this one for size.
Assuming that the ancestors of the theropods were cold-blooded reptiles, then there is no amount of ‘mutations and natural selection’ that could change cold to warm.
Barbarian chuckles:
Show us that. Sounds interesting.
You're proposing the theory. Defend it.
So you have no evidence for your claim that it couldn't evolve, you just hope we believe it? O.K.
Meantime, here's some of the evidence for endothermic dinosaurs. Haversian canals, high metabolic output, running and flying, insulation on bodies, etc. Even many creationists admit it.
The primary use of feathers in birds is for warmth and display. Many of them can also fly, but that's not the first use. Dinosaurs had feathers long before any of them could fly.
None of them could ever fly.
Microraptor and Archaeopteryx could fly a little.
As I keep pointing out, there are no flight instincts available
Remember, flight uses the same movements and structures used by small theropods in running. As usual, something already there, modified to a new use.
.and some joker's idea (in a P-A--P---E--RRRR!) that the shoulder joints could support the flying movement of the wing doesn't make it so
Microraptor's shoulder joint allowed an upward reach needed for a strong wing movement. No point in denying it.
Your problem (another one) is that you can't distinguish between fact and speculation, but think they are both identical.
I'm sympathetic to your issue about evidence. But denying it won't help you. Learn more about the subject and you'll do better.