Early posts on RRC 287/1.
(Is it just me or is there only one baby under that wolf?! Not that it’s the finest execution but usually there is more of an attempt to indicate both twins.)
Update 6-30-17:
http://arachne.uni-koeln.de/item/reproduktion/3308096
http://arachne.uni-koeln.de/item/objekt/207558
http://arachne.uni-koeln.de/item/reproduktion/3308097
http://arachne.uni-koeln.de/item/objekt/207559