wiki on speciation[^] In addition, all humans are the same species, Homo sapiens. For a while, we thought there was evidence of another species of humans living about 13000 years ago on a small island in Indonesia (Homo floresiensis[^]), but this turned out to be "just" a pygmee (published in Proceedings of the National Academy of Sciences, USA, vol 103, issue 36). As others have said, races do not have a biological meaning. Instead, you talk about variants or strains of a specific species. So, the "races" of dogs, for instance, all belong to the same species (Canis lupus; this species also includes wolves (yes, they are the same species as dogs!). However, dogs are commonly separated into their own sub-species, Canis lupus familiaris, sometimes referred to as Canis familiaris as if they were a species of their own). A somewhat simplistic definition of species is that if two individuals (of opposite sex, apparently) can have fertile offspring they belong to the same species. This is exemplified by mules, which arise as sterile offspring of a horse and an ass (or is the right name a donkey?). Horses and asses are different species, so the mule is a sterile hybrid. Back to the original question: You cannot separate humans into different species or even subspecies, we're all Homo sapiens, no matter what the rednecks say. And separation into races is artificial and just the result of mankinds everlasting need to put everything into neat little boxes that can be overly simplistic labelled.
Cheers Steen. "Are you gonna check your makeup when you're done whining?" John Simmons, 05/31/2006