How does hybridization among rock wallabies complicate mapping the macropod family tree?

It suggests that some groupings once considered distinct might share a much more recent common ancestor than assumed

The observation of ongoing or recent interbreeding among rock wallabies challenges the clean break model used when mapping evolutionary divergence paths. If gene flow persists between groups classified as separate species, it implies that the genetic isolation barrier was incomplete or developed slowly. Consequently, when genetic analysis is performed, researchers must account for this mixing, as it suggests that the timing of evolutionary splits between genera or species may need revision, potentially pushing the common ancestor of these groups closer in time than prior models based on morphology alone suggested.