A.C.H.  wrote or quoted:

> I've seen various lists dealing with "limits of selection"; reasons
> why natural selection would not result in perfect (or optimal)
> adaptation. (Dawkins, Mark Ridley, Mayr).
> 
> The following reason is, i believe, not in those lists:
> 
> because an adaptation is caused by its selection pressure, it can not
> escape its selection pressure.
>
> Again:
> The adaptation is linked to whatever selects it, it can not outperform
> it.
> 
> Again:  
> an example: a prey will never be able to definitely outperform its
> predator, because there is no selection beyond what's actually doing
> the selecting (the predator).

A predator is not some sort of fixed target.  Typically, it too is evolving.
-- 
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