Sometimes we just dig the Cigar- null hypothesis in sexual selection

Not all the traits that are there became that way because of some – well as of yet unhidden reason (but that our storytelling minds most certainly can confabulate one for).  Preferences can be arbitrary, and then take off.  A bit like fashion sometimes, perhaps.  And, this may be a bit hard to wrap ones head around. 

Carl Zimmer has a great post up on this null-hypothesis (it is from 2010 – on the web time is not of the essence), with links to academic papers on this. 

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