These are interesting lizards...although they stay together in groups, sometimes one is cast out of the group. I was given some "outcasts" quite a few years ago to study...unfortunately I didn't have enough of them to figure anything out....
"Female Cunningham's skinks produce between 4 and 6 live young in late summer. These will usually hang around the parents for several years forming quite close family groups"...
http://www.reptilepark.com.au/animalprofile.asp?pid=35&id=75
"E. cunninghami maintained outbreeding in the face of increased accumulation of relatives"...
http://www.ncbi.nlm.nih.gov/pubmed/14717898
"adults frequently attacked unrelated juveniles but not their own offspring"...
http://www.sciencedirect.com/scienc...6ca05a86efe2835c72ecea5f8f311381&searchtype=a
"Female Cunningham's skinks produce between 4 and 6 live young in late summer. These will usually hang around the parents for several years forming quite close family groups"...
http://www.reptilepark.com.au/animalprofile.asp?pid=35&id=75
"E. cunninghami maintained outbreeding in the face of increased accumulation of relatives"...
http://www.ncbi.nlm.nih.gov/pubmed/14717898
"adults frequently attacked unrelated juveniles but not their own offspring"...
http://www.sciencedirect.com/scienc...6ca05a86efe2835c72ecea5f8f311381&searchtype=a