Why the Technology of Wheels does not Appear in Animals?

Why aren't there wheeled turtles, 
for instance?  (Picture from:  
http://www.livescience.com/)

Animals have almost all the technologies that exist in the human world. For example, the magnetic compass of migrating geese, dolphin sonar technology, beaver dams, and ants agricultural technology. All those technology that evolved over millions of years even through evolution before humans find it.

However, from a variety of advanced technology, there is one technology that does not exist in the animal world. Technology is the "wheel". Why is no one type of animal that has a "wheel"?

Each type of animals moving in their own way. There is a running, jumping, swimming, diving, gliding, and even rolling like a ball. But no one has a body part that can rotate: the natural wheel.

The researchers looked at the fact this is quite strange, considering that the technology is not as complicated as Wheel animal body parts, such as eyes. "While the wheel is nothing more than a cylinder which rotates freely on a fixed axis," the researchers said, as quoted by LiveScience, Wednesday (8 August 2012).

Evolutionary biologists say the complexity of the eye appears as a result of living needs to be light. It took 400 thousand years to develop a complex eye.

While the wheel, on the other hand, is actually a complex system that can not be simplified. Wheels must be made to work perfectly. If the circle is not perfect, does not fit with the axle, the wheels will not roll.

Wheels can only be made ​​by someone with great skill. This explains why people do not find the wheel until the Bronze Age, when humans are able to cast metal.

Evolutionary biologist Richard Dawkins said the animal had never started to develop a natural wheel-like organ because the locomotion organ was considered not beneficial for animals. *** [LIVESCIENCE | MAHARDIKA SATRIA HADI | KORAN TEMPO 3966]

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