mapkinase's Journal: One or six giraffe species?

BBC reports that

a report in BMC Biology uses genetic evidence to show that there may be at least six species of giraffe in Africa." ...

"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 the University of California Los Angeles (UCLA), told BBC News.

Yet:

"The results were a surprise because although the giraffes look different, if you put them in zoos, they breed freely."