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Giraffes May Be Six Separate Species
The BBC reports on research, published in BMC Biology, pointing to the possibility that there may be at least six species of giraffe in Africa. Quoting: "'Using molecular techniques we found that giraffes can be classified into six groups that are reproductively isolated and not interbreeding,' David Brown, the lead author of the study and a geneticist at... UCLA told BBC News. 'The results were a surprise because although the giraffes look different, if you put them in zoos, they breed freely.'"
Reproductive isolation is a major characteristic of speciation. Lions and tigers, horses and donkeys, etc are different species, but under unnatural conditions may mate and even produce offspring. Depending on how unrelated the species are, the offspring may or may not be viable.
Speciation is not as cut-and-dried as you might think. Reproductively isolated populations diverge more and more over time, and the speciation becomes more and more pronounced.