| 作者 |
|
lebronviii
初级会员
注册日期: 2011-7-06
发贴数: 2
|
| 发贴日期: 2011-7-06 17:43 | IP 已记录
|
|
|
mmediate ancestors lived in trees. Members of this school think that powered flight developed as a natural extension of gliding (such controlled falling is used as a way of travelling from tree to tree by several arboreal
species today). Gliding itself developed because of the lift provided by feathered forearms.
The alternative is that flight evolved on the ground. Some researchers who belong to this school of thought suggest that the power provided by flapping protowings may have given their owners an edge in the pursuit of prey. Others hypothesis<a href="http://www.shopralphlaurenoutlet.com/">polo ralph lauren</a>e that feathery forearms helped animals steer and stabilise themselves.
Unfortunately, behaviour does not fossilise, so it looked as though the question might never be <a href="http://www.kobevilebron8.com/">lebron viii</a>answered. But Dr Glen, a palaeobiologist, and Dr Bennett, a biomechanic, think they have worked out how to do so. Their crucial observation is that in modern birds the curvature of t<a href="http://www.kobevilebron8.com/">lebron viii</a>he third toe (which carries a lot of weight during walking and climbing) varies with species' lifestyles. Birds that spend lots of time climbing around on the trunks of trees have dramatically curved third toes. Those that hop around on b<a href="http://www.juicycoutureoutletusa.com/">juicy couture
outlet</a>ranches have mildly curved ones. Those that forage mainly on the ground have the least curved of all.
The two researchers compared these observations with their findings for the bird-like dinosaurs and dinosaur-like birds of China. They noticed that the toes of both feathered dinosaurs and of the earliest flying birds were similar to those of modern birds that spend most of their time on <a href="http://www.shopralphlaurenoutlet.com/">ralph lauren
outlet</a>the ground. Flight, in other words, came before birds took to the<a href="http://www.shopralphlaurenoutlet.com/">ralph lauren
outlet</a> trees. They are not fallen angels, but risen reptiles.
__________________
Kobe Vi
juicy couture handbags
|
| 回页首 |
|
| |
Guests
访客
注册日期: 2003-6-11
发贴数: -329
|
| 发贴日期: 2011-8-12 11:55 | IP 已记录
|
|
|
This summer, louboutin sale has become the synonymous of fashion and sexy. Go to our discount christian louboutin shoes sale online, we ensure high quality cheap louboutin shoes products and services, competitive prices and prompt christian louboutin pumps delivery. Don't hesitate, if you want to be more beautiful christian louboutin shoes, you need them http://www.cheaplouboutinshoeszone.com/.
|
| 回页首 |
|
| |
Guests
访客
注册日期: 2003-6-11
发贴数: -329
|
| 发贴日期: 2011-8-12 11:55 | IP 已记录
|
|
|
If you are looking for perfect christian louboutin uk, you can search in our discount christian louboutin shoes online store. We have prepared many different kinds of discount louboutin shoes on sale. The best service and top quality christian louboutin shoes are provided to you. Do not miss christian louboutin on sale this rare opportunity, take action at once http://www.christianlouboutinsdiscounted.com/.
|
| 回页首 |
|
| |
Guests
访客
注册日期: 2003-6-11
发贴数: -329
|
| 发贴日期: 2011-8-12 11:55 | IP 已记录
|
|
|
The cheap louboutin shoes are so popular, not only for its christian louboutin shoes, but also for the louboutin shoes on sale, pumps, slingbacks, ect. Our website offer a lot of discount louboutin shoes style and color of cheap louboutin pumps, and we also offer probably the most magnificent footwear inside most cheap prices http://www.louboutins-ladyheels.com/.
|
| 回页首 |
|
| |
Guests
访客
注册日期: 2003-6-11
发贴数: -329
|
| 发贴日期: 2011-8-12 11:55 | IP 已记录
|
|
|
I believe the sale of christian louboutin shoes will be the most hot brand in the discounted louboutin pumps world, and it will never change. For these christian louboutin on sale can highlight people's elegant temperament and noble social discount christian louboutin shoes status. Many famous stars always choose this brand cheap louboutin shoes as their secret weapons in the important fashion occasions http://www.louboutins-pumps-outlet.com/.
|
| 回页首 |
|
| |
Guests
访客
注册日期: 2003-6-11
发贴数: -329
|
| 发贴日期: 2011-8-12 11:55 | IP 已记录
|
|
|
With the red sole, christian louboutin pumps look more sexy and pretty. Their unique discount christian louboutin shoes design have attract many ladies want to follow christian louboutin pumps behind them. It believe these cheap christian louboutin shoes will become most girls new collection in 2011. In my eyes, the ket to become more fashion discount christian louboutin heels is to wear this brand shoes. It is worth you to have a try http://www.christianlouboutinshoesuk.com/.
|
| 回页首 |
|
| |
Guests
访客
注册日期: 2003-6-11
发贴数: -329
|
| 发贴日期: 2011-8-12 11:55 | IP 已记录
|
|
|
Recently, cheap christian louboutin pumps hot around the world. Almost every one wants to own this louboutin sale brand shoes. These discount christian louboutin shoes are more and more popular all over the christian louboutin store world. With the increasing demand of these christian louboutin zappos shoes, a great number of shoes opened at website http://www.highheels-louboutins.com/.
|
| 回页首 |
|
| |
Guests
访客
注册日期: 2003-6-11
发贴数: -329
|
| 发贴日期: 2011-8-12 11:55 | IP 已记录
|
|
|
Recently, I have find this wonderful moncler down jackets, here many discount monclers are very fashionable and unique. I want to share moncler coats it with other people. You will be deeply attracted by this online moncler store. Do not wait for any more, click into moncler sale and take close to look at these products http://www.monclers-jackets-sale.com/.
|
| 回页首 |
|
| |
Guests
访客
注册日期: 2003-6-11
发贴数: -329
|
| 发贴日期: 2011-8-12 11:55 | IP 已记录
|
|
|
When you put down your favorite color moncler jackets, you will never forget moncler outlet that moment, so that people will pay close attention to the end of your moncler men coat, again. I am sure monclers online will be the first choice of cheap down jackets women is the best choice http://www.winterjackets-sale.com/.
|
| 回页首 |
|
| |
raphaellee
初级会员
注册日期: 2011-8-18
位置: United States
发贴数: 2
|
| 发贴日期: 2011-8-18 16:37 | IP 已记录
|
|
|
kann seine Wärme nicht überbetont werden,Moncler Jacken Outlet die aktuelle Exposition der olivgrünen Farbe nur.Moncler Daunenjacke Bündchen für das Design,Moncler Daunenjacke und mit dem legendären roten und weißen von Moncler Dekoration.
__________________
Moncler Daunenjacke Onlineshop
|
| 回页首 |
|
| |
活动主题 
会员列表 
搜索
注册新会员 
登录 
帮助
乾坤论坛 : 乾坤烛论坛
主题: ralph lauren outlet
