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Message: <blockquote data-quote="Seashore" data-source="post: 1810608" data-attributes="member: 79661">The problem with all these species concepts and why the argument wont be resolved is that there are too many agendas on how by using a particular species concepts can be used to push a particular barrow. We, as people use species as a way of identifying recognisable taxa (for personal or scientific purposes) and that is fine. Systematics, however, want to define species as a biological unit by defining species limits and thereby putting each bird into a particular box. Unfortunately species just don't fit that easily into a box. Hence the plethora of species concepts in attempts to do so and the use of sub-species, clines, morphs, ecological units etc. all of which muddy the boundaries for the ordinary person and for the animal itself, is irrelevant.So, use whatever system that suits your purpose. You'd have to be dreaming that you can argue a species concept that will achieve broad agreement, let alone resolve the issue.Chris Shaw</blockquote>