"interbreeding does not normally happen". NORMALLY.
is the distinction between race and species semantic only? (wikipedia does not seem to address the question
In biology, a species is:
* a taxonomic rank (the basic rank of Biological classification) or
* a unit at that rank (in which case the plural is "species". This is sometimes abbreviated: "spec." or "sp." singular, or "spp." plural).
There are many definitions of what kind of unit a species is (or should be). A common definition is that of a group of organisms capable of interbreeding and producing fertile offspring of both genders, and separated from other such groups with which interbreeding does not normally happen. Other debatable definitions may focus on similarity of DNA or morphology. Some species are further subdivided into subspecies, and here also there is no close agreement on the criteria to be used.