The take home message Chrish was working on, in case you have not studied up on your species concepts, is that species designation is practically subjective. If you remember a few simple things, you will see the difficulty of taxonomic classification...

All species go extinct eventually.

Genes are constantly mutating, nature is not static, this is the mechanism for the above statement.

Species designation is subjective, and is driven purely by our incessant need to organize nature.



There are several popular methods of assigning species, but as Chrish pointed out, none of them work all of the time. I stay out of species arguments, it is ridiculous to argue about them, unless they change the name of something I like and then I get all huffy and puffy.
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*Humans aren't the only species on earth... we just act like it.



".the oldest task in human history: to live on a piece of land without

spoiling it."

Aldo Leopold (1938)

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