Comments Good luck with this review. On the face of it, the article looks fine, and I hope to see it as a future Featured Article Candidate. It is outside my area of expertise, so I will leave it to the others to review, but I do have one comment. The bit about the number of chromosomes makes me wince because while I know that there are schools of zoology in North America that believe that the number of chromosomes defines a species, this is rejected by scientists here, because marsupials are not so fussy about their chromosomes, and it would greatly multiply the number of species to no purpose. Good luck with the review.