Hello. I have two joeys, one male and one female 10 days OOP. In the cage I also have the joeys' mother and father, an older sister about 6 months OOP, and an unrelated adult female. My issue is that I've seen the female joey riding on the backs of all three other females--the mother, the sister, and the unrelated female. I have not seen the male joey doing this. Is this normal? I have not seen this behavior in my previous joeys.. they seem to stick to the backs of their mother and father.