Sorry for the semi-cross-post:
ok, now I realize I have taken the stalking thing to a whole new category of personal-space-invasion, but I have had a peek at everybody's fluffy bums, and they all have identical vents, some even very damp.
Surely this is proof of them all being girls???
Vent = girl, yes???
Oh, and they all squat, now, except for Mathilda (the suspected roo from my Russell Crowe post), who is just not having any of it. She does have her very own damp vent, tho.