tropical and subtropical latitudes of South America
110 millimetres (4.3 in)
Danaus erippus has a wingspan reaching about 110 millimetres (4.3 in), with an easily recognizable orange and black pattern. Until 2007, this butterfly has been treated as a subspecies of the monarch sister species Danaus plexippus. In effect, they are very similar, but D. erippus usually has an orange trailing edge of the forewings, while in D. plexippus it is black. The colour of the wings in males of the southern monarch is paler than in the females.