Siberian roe deer
Alexander S. Graphodatsky looked at the karyotypy to present more evidence to recognise these Russian and Asian populations as a separate species, now renamed the eastern or Siberian roe deer ("Capreolus pygargus"), in his 1990 paper. The taxa are differentiated by the B chromosomes found in "C. pygargus", populations of this species gain more of these strange 'junk' chromosomes as one moves further east.