Similarly is there a term for mutually interbreedable but distinct `species'?
There's not really any objective standard to draw the line between such populations. A clear line exists between populations that cannot reproduce, and there is probably something similar for populations that can reproduce but largely make sterile offspring (Ligers, Mules).
There's not really any objective standard to draw the line between such populations. A clear line exists between populations that cannot reproduce, and there is probably something similar for populations that can reproduce but largely make sterile offspring (Ligers, Mules).