Tony: Clearly points to the interbreeding between the lineages. Which would suggest either that A.) They are all sub-species of a single parent species and hence different in degrees, or B) They are all the same species. > > You are right about the irony, but, we have to work with some sort of concept of species, even if there is not a clear dividing line: Tigrons and ligers as excamples.-Yes we do, and in your example, they are called cats, or felines.Any successful cross breeding between canines and felines?