Rath on 08 October 2009
@Kasz actually species is just a rather aribitrary thing. It doesn't need to be impossible for them to breed physically and produce fertile offspring, it just requires some barrier to reproduction.
In the case of wolves and dogs it's the fact that the wolves live in habitats that the dogs (even the wild dogs such as dingoes) do not occupy. Hence they don't breed and as such are different species.
The species classification has its uses but it also has its limitations and most of those are a heck of a lot of grey area.
