This is a crap shoot, because I don't remember my source or what it was referring to, but here goes..

I once heard that in some situations where the male of the species is not present, that the females will create their own hierarchal pecking order.

And,that is unfortunately all I remember. When I started to type, everything I was thinking flew out of my head.

Listen to Ostlyn, s/he is smarter than myself.
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2.2 Corn Snakes
1.2 Leopard Geckos
1.1 Crested Geckos
1.2 Green Anoles
1.0 Russian Tortoise
3.2 House Cats
0.0.1 African Millipede

RIP
Alice, Bruno, Lars