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The example you give with the finches, Justatruthseeker, needs some qualifiers you omitted. As Darwin himself pointed out, there can be real problems defining just was a species is. This is also a problem recognized today. Hence, the fact one challenges another's definition of a species in no way invalidates evolution. it simply points to difficulties that are occupational hazards here. For example, astronomy has had trouble in defining just ws is a planet.
What real problem? They are interbreeding and producing fertile offspring right in front of your eyes. Do you find that reality so hard to grasp? Now if they were not interbreeding right before your very eyes then there might be a problem - and you might have to look for other ways in defining them.
https://en.wikipedia.org/wiki/Species
"While in many cases this definition is adequate, the difficulty of defining species is known as the species problem."
I find it quite adequate in this situation - do you not? What ambiguity lies in the fact they are interbreeding and producing fertile offspring right in front of your eyes? There is no ambiguity.
http://dictionary.reference.com/browse/species
"Biology. the major subdivision of a genus or subgenus, regarded as the basic category of biological classification, composed of related individuals that resemble one another, are able to breed among themselves, but are not able to breed with members of another species."
http://www.merriam-webster.com/dictionary/species
" (1) : a category of biological classification ranking immediately below the genus or subgenus, comprising related organisms or populations potentially capable of interbreeding, and being designated by a binomial that consists of the name of a genus followed by a Latin or latinized uncapitalized noun or adjective agreeing grammatically with the genus name (2) : an individual or kind belonging to a biological species."
http://www.biology-online.org/dictionary/Species
(1) The lowest taxonomic rank, and the most basic unit or category of biological classification. "
(2) An individual belonging to a group of organisms (or the entire group itself) having common characteristics and (usually) are capable of mating with one another to produce fertile offspring. Failing that (for example the Liger) It has to be ecologically and recognisably the same."
Where is the ambiguity when they are interbreeding and producing fertile offspring right in front of your eyes???? We are not talking about two animals not known to interbreed or that are not producing fertile offspring. I sense discomfort and avoidance of the real point being made by your own scientific definitions.
I would go further to say you have created your own problem by calling two birds that interbreed and produce fertile offspring separate species - while at the same time insisting that other birds that interbreed and produce fertile offspring are the same species precisely because they do so. You can't cause the problem and then complain the problem exists because you caused it. Your refusal to accept that mistakes were made simply compounds the problem, making it worse - not better.
No one is arguing that if two birds are not observed to mate and they are not recognizably the same - then there might be reason to look for other ways to tell if they are the same species or not. But even their own DNA tests could tell no difference between the six classes of birds - arguing for their being one species even more than the direct observation of their producing fertile offspring which should of settled it and solved the problem anyways.
You are making me think you are avoiding accepting the science for some strange reason? And for the life of me I can't figure out why someone that claims to follow science would so readily ignore the scientific definitions of what a species is - when there can be no doubt at all according to both the observational evidence and the DNA results?
You all talk about not understanding. I agree. I certainly do not understand your reluctance to accept the observations or the DNA evidence at all? Or even your own definitions, because I can assure you it was not a creationists that wrote those definitions - but a collaboration of evolutionary biologists. There is nothing ambiguous in the observations or the DNA, the only thing ambiguous is why you will not accept what both are telling you but continue to look for reasons to ignore both?
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