[CPN] Article 21

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Points taken, but...

> (I also don't think that most  biologists really adopt different 
> species concepts, though they tend to confuse operational criteria
 > with concepts).

Different criteria lead to different results. At our 2nd meeting (Yale 
2006), somebody (Yannick Bertrand, I think) gave a presentation, saying 
that there are from 101 to 249 endemic bird species in Mexico, depending 
on what one means by "species". That's what I mean.

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