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Author Topic:   Birds and Reptiles
faith24
Junior Member (Idle past 3444 days)
Posts: 27
Joined: 09-10-2010


Message 1 of 135 (581893)
09-17-2010 11:25 PM


I am new to this so i'm sorry if this may sound stupid. I would appreciate if someone can answer this question.
How do scientists classify what a bird is and is not, particularly with regard to their possible evolution from dinosaurs? Some say that birds appear earlier in the fossil record than the dinosaurs.
Edited by faith24, : No reason given.
Edited by faith24, : No reason given.
Edited by Admin, : Rewrite to make the topic more clear.

Replies to this message:
 Message 2 by Admin, posted 09-18-2010 7:30 AM faith24 has replied
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faith24
Junior Member (Idle past 3444 days)
Posts: 27
Joined: 09-10-2010


Message 3 of 135 (581954)
09-18-2010 11:03 AM
Reply to: Message 2 by Admin
09-18-2010 7:30 AM


Sorry. There i changed it.

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 Message 2 by Admin, posted 09-18-2010 7:30 AM Admin has replied

Replies to this message:
 Message 4 by Admin, posted 09-19-2010 8:06 AM faith24 has replied

  
faith24
Junior Member (Idle past 3444 days)
Posts: 27
Joined: 09-10-2010


Message 5 of 135 (582043)
09-19-2010 11:00 AM
Reply to: Message 4 by Admin
09-19-2010 8:06 AM


Yes.

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faith24
Junior Member (Idle past 3444 days)
Posts: 27
Joined: 09-10-2010


(1)
Message 14 of 135 (582498)
09-21-2010 4:44 PM


This article seem to say otherwise about dino-bird evolution. Maybe it was the other way around?
http://www.physorg.com/news184959295.html
There are many differences between birds and dinosaurs. Their lungs, reproductive system, etc. Birds breathe more because they have special lungs. They're incapable of moving their thigh bones like that of dinosaurs, so their lungs will collapsed if they do.
Edited by faith24, : No reason given.
Edited by faith24, : No reason given.
Edited by faith24, : No reason given.

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 Message 15 by jar, posted 09-21-2010 4:55 PM faith24 has replied
 Message 16 by Taq, posted 09-21-2010 4:57 PM faith24 has not replied
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faith24
Junior Member (Idle past 3444 days)
Posts: 27
Joined: 09-10-2010


(1)
Message 20 of 135 (582877)
09-23-2010 6:17 PM
Reply to: Message 15 by jar
09-21-2010 4:55 PM


quote:
Actually that doesn't say that birds came before dinos or that dinosaurs evolved from birds, just that the split may well have been earlier and some of the finds may have been misidentified.
This is another example of why Science will work. As more information is learned, even strongly held opinions get challenged.
You know, people always thought that birds evolved from dinosaurs. That's why we got the idea "then how come there are still birds"? So now, they changed it and say that they share a common ancestor. So the ancestor between modern birds and dinosaurs is the Archeopteryx right?
Some suggest that the Archeopteryx is just a perching bird. There are huge differences between birds and dinosaurs that it is impossible for birds to evolved from dinosaurs. The idea is so confusing even after looking on the subject for a while now i'm still confused because there are a lot of misinformation out there you don;t know which one to believe.
What do you think about these birds foot print?
Geotimes - June 2002 - Bird Fossil Feet

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Replies to this message:
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faith24
Junior Member (Idle past 3444 days)
Posts: 27
Joined: 09-10-2010


(1)
Message 22 of 135 (582888)
09-23-2010 6:49 PM
Reply to: Message 21 by Dr Adequate
09-23-2010 6:28 PM


quote:
No they didn't.
So if birds didn't evolved from the dinosaurs, then birds have their own lineage apart from dinosaurs. So then evolution would say that they both share a common ancestor. So how did people came up with the idea that birds evolved from dinosaurs? That must be a misconception of what evolution says then.
quote:
No.
Who are the ancestors? I'd like to know.
quote:
Yes, by definition it's a bird. But "just" a bird? No.
How do you tell if it's a bird or not?
quote:
Perhaps you could mention some of these "huge differences" and demonstrate the impossibility.
Or perhaps you prefer to indulge in vacuous rhetoric.
Birds cannot move their thigh bone so they must bend their knee while walking or running. Land creatures such as the theropods can move their thigh bone. Also birds required more oxygen than cold blooded animals and so to supply this need, birds have special lungs and supporting musculature. If birds have the same muscle structure as the dinosaurs and could move their thigh, their lungs would collapsed.
quote:
If you have really been "looking at the subject for a while", how is it possible for you to write nonsense like this? ---
Because people are saying different things.
Edited by faith24, : No reason given.
Edited by faith24, : No reason given.

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Replies to this message:
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