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Author Topic:   Bird Evolution
RAZD
Member (Idle past 1426 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 5 of 17 (139671)
09-03-2004 4:40 PM
Reply to: Message 1 by Monsieur_Lynx
09-03-2004 3:42 PM


yawn
Another ill informed argument from incredulity. Just because you cannot imagine how such a system could have evolved, you have to devise some other mechanism that is even more complex than evolution ... evolution with a hand-maid.
fyi -- it is birds from dinosaurs, with the latest information being that the dinosaurs were warm-blooded. There are other similarities in the bone structure and the skull that put birds closer to dinosaurs than to reptiles.
There are many articles on the possible development of flight, and I suggest you at least read these before jumping off a tree and falling flat on your face.
This sounds like typical "all-at-once" erroneous thinking typical of creationists. I also suggest that you wean yourself from creationist thinking if you are going to pursue ID because they are ultimately incompatible.
enjoy.
ps -- I know why creationist types shy away from gradual evolution of features and characteristics "creating the various CREATures that we see."

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
 Message 1 by Monsieur_Lynx, posted 09-03-2004 3:42 PM Monsieur_Lynx has not replied

  
RAZD
Member (Idle past 1426 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 8 of 17 (139698)
09-03-2004 5:32 PM
Reply to: Message 6 by Coragyps
09-03-2004 4:54 PM


so many different solutions
there are actually many examples of different solutions to the question of flight
small spiders extrude a silk thread into the wind until they are lifted off to float on the wind
some species of the "walking stick" family have evolved flight wings, lost them and evolved them again.
bats, squirrels, snakes, birds, insects, arachnids, elphants (no wait ... that doesn't happen until after the next election ... ) ...
the sheer diversity of solutions says that many are possible so the "probability" of developing a working one is high.
wings are also similar to flippers -- see how a penquin and the flightless cormorant fly.
it's all good.
enjoy
(ps -- the snake is in the constrictor family -- it's not always to get away )

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
 Message 6 by Coragyps, posted 09-03-2004 4:54 PM Coragyps has not replied

  
RAZD
Member (Idle past 1426 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 10 of 17 (139788)
09-03-2004 11:55 PM
Reply to: Message 9 by ThingsChange
09-03-2004 7:11 PM


flying frog
actually there is a "flying frog" as well - with another different adaptation to the problem of "it's not the fall that kills you, it's the sudden stop at the end"
Another score for adaptability and enhanced characteristics by selection over time. (that's evolution for those who don't get it )
{added}
ps -- this is Wallace country and this frog is also known as "Wallace's Flying Frog"
http://www.ecologyasia.com/...ates/wallace's_flying_frog.htm
Enjoy.
This message has been edited by RAZD, 09-03-2004 10:58 PM

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
 Message 9 by ThingsChange, posted 09-03-2004 7:11 PM ThingsChange has not replied

Replies to this message:
 Message 11 by Andya Primanda, posted 09-06-2004 5:16 AM RAZD has replied

  
RAZD
Member (Idle past 1426 days)
Posts: 20714
From: the other end of the sidewalk
Joined: 03-14-2004


Message 12 of 17 (140349)
09-06-2004 1:20 PM
Reply to: Message 11 by Andya Primanda
09-06-2004 5:16 AM


Re: flying frog
Hey Andy!
Oh, and given all those creatures, I'd definitely say flight evolved from top down.
Every time?
I think that argument can be made where existing limbs have evolved into wings with fair confidence, but I would still hold off on exclusivity.
The discovery of four-winged dinosaurs shows that the glider path may be one of the solutions (see Error).
But the demonstrated advantage of young grouse to climb trees using wings to augment their legs before they are developed enough for flight shows a "ground up" advantage (see CNN.com - Dinosaurs' flapping led to flight? - Jan. 18, 2003):
. So these baby birds, born with big feet and big, powerful legs, use them in combination with their wings, first to stay balanced and grounded, and then to take on steeper and steeper inclines. Birds in the turkey and quail families use the same techniques.
Using this "wing assisted incline running," Dial reports in this week's issue of Science magazine that chukar partridges can negotiate 50 degree inclines from the time they are born, 60 degree slopes when they're just four days old, and at 20 days, can perform a vertical ascent with all the skill of Spiderman.
And the use of winglike structures by stoneflies to skim on the surface of water but not to fly also demonstrate a possible path of development for insects where wings did not develop from existing limb structures (see http://www.rps.psu.edu/student/marden.html}:
Stoneflies spend much of their lives as underwater nymphs, but they must surface and travel to land to mate ... held up by its buoyant feet ... the stonefly is pushed by its whirring wings, like a fan-boat cruising the bayou. Though the stoneflies never engage in true flight -- they don't leave the water surface -- they can reach speeds of 35 centimeters per second (by comparison, a wasp travels at over 100 centimeters per second).
The article has a links that can get you eventually to Jim Marden’s website as well as links directly to videos of this process. You can find out more about Jim from http://www.bio.psu.edu/People/Faculty/Marden/index.html
Personally I think the diversity of flight mechanism show that a diversity of paths to develop flight is just as possible as the diversity of paths for development of the eye.
Enjoy.

we are limited in our ability to understand
by our ability to understand
RebelAAmerican.Zen[Deist
{{{Buddha walks off laughing with joy}}}

This message is a reply to:
 Message 11 by Andya Primanda, posted 09-06-2004 5:16 AM Andya Primanda has not replied

  
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