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Re: Little skulls...

>>>>It is not *that* quickly.  The papers suggests tens or hundreds of
thousands of years, if not longer.  It is probably due to relaxed
selection, allowing accumulated mutations to decompose the defensive
behaviors.  Indeed there may even be selection *against* some of the
defensive behaviors, to the extent they reduce reproductive efficiency in
the *absence* of cuckoo eggs.<<
How do we know it's taking place if it takes thousands of years?