ruveyn wrote:
Our species, homo sapien sapien is one of the least biological diverse of the mammalian species. Any two members of our species of opposite genders and having working reproductive plumbing are capable of breeding.
That's true of any species. By definition, when two creatures of opposite genders can mate and produce viable offspring, they are of the same species. If it were, say, a saint Bernard (um, is that supposed to be capitalized? Spellcheck wouldn't accept it uncapitalized, but I didn't think dog breed names were proper nouns.. am I an idiot?) and a teacup chihuahua, the mechanics may fail.. but the genetics would be compatible.
http://dictionary.reference.com/browse/species wrote:
2. 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.