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Author Topic:   Birds and Reptiles
New Cat's Eye
Inactive Member


Message 34 of 135 (598196)
12-29-2010 10:58 AM
Reply to: Message 20 by faith24
09-23-2010 6:17 PM


Look at the feets!
There are huge differences between birds and dinosaurs that it is impossible for birds to evolved from dinosaurs.
Well I think there's huge similarities! Look at their feets:
quote:
And look how similiar their feet are:
The emu feet still have scales on them!
you can click on the above pictures to expand them
Taken from the OP in a thread I made: Theropods and Birds showing a change in kinds
Have a look, I think its worth it, plus there's lots of pictures

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 Message 20 by faith24, posted 09-23-2010 6:17 PM faith24 has not replied

Replies to this message:
 Message 35 by arachnophilia, posted 12-29-2010 6:27 PM New Cat's Eye has replied

  
New Cat's Eye
Inactive Member


Message 36 of 135 (598325)
12-30-2010 10:59 AM
Reply to: Message 35 by arachnophilia
12-29-2010 6:27 PM


Re: Look at the feets!
Catholic Scientist writes:
The emu feet still have scales on them!
so, birds have two kinds of scales on their feet: reticulae (on the bottoms, the round reptilian scales) and the scutellae (flat plate-like scales on the top).
it turns out that the scutes have a strong relationship to feathers, and lacking a certain protein in development, become feathers. this likely means that birds have one gene that controls feather development all over their bodies, including their feet (such as in microraptor), and another that turns them off in particular places.
ie: the dinosaurian scales evolved from feather, not vice-versa.
Awesome information! Thank you.
Its not that hard to imagine scales and feathers as being a variation of the same "thing". I always thought that feathers were just elongated scales but I guess I'll have to change that to some scales just being shortened feathers.
I'm gonna add this link to my other thread, thanks again.
Where'd the reticulae come from? Fish have scales, but the amphibians don't, and then reptiles do again. Are there any semi-scaly amphibian fossils? I wonder how early the retiples split...
I suppose I have some reading to do.

This message is a reply to:
 Message 35 by arachnophilia, posted 12-29-2010 6:27 PM arachnophilia has replied

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 Message 37 by arachnophilia, posted 12-30-2010 7:32 PM New Cat's Eye has replied

  
New Cat's Eye
Inactive Member


Message 90 of 135 (598861)
01-03-2011 11:32 AM
Reply to: Message 37 by arachnophilia
12-30-2010 7:32 PM


Re: Look at the feets!
in any case, i personally feel that feathers probably go back just slightly further than that, perhaps to basal archosaurs, and go hand-in-hand with the evolution of endotherms. for instance, pterosaurs sometimes have "hair" covering their bodies, and iirc, these "hairs" are strongly related to feathers -- they just didn't evolve into the flight surfaces and were strictly used for warmth.
In the other thread, in Message 99, RAZD provided this link:
Feather evolution
It has a shit-ton of information so have fun!

This message is a reply to:
 Message 37 by arachnophilia, posted 12-30-2010 7:32 PM arachnophilia has not replied

  
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