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What species, externally, do not symmetric, or nearly so, left and right sides?

Asked by Halliburton_Shill (268points) April 8th, 2009

As inspired from this:
http://www.answerbag.com/q_view/1391093

I’m not talking about tiny variations that would disappear as a result of environment adaptation. Consider birds, humans, and buttocks as examples of the symmetric. A fiddler crab as an example of non-symmetric.

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