Hi,
For a long long while it has been known that there are a few mechanisms which have never been duplicated by Mother Nature. The wheel would be an example, very difficult concept.
Many others such as the lever, wings, hypodermics, suction pads, etc are old news , but now we know that gears exist as well in Nature...
http://www.popularmechanics.com/scie...ature-15916433
As an engineer, I am just gobsmacked by this. Think of the evolutionary process needed to come up with sector gears in an insect!
Cheers