Intro question, before the actual intro

[her.corner]

So I've adopted 2 spayed girls and 1 neutered boy to add to my current group of 4 girls. Right now my 4 girls are living in the top half of a ferret nation and the 3 new ratties are living in the bottom half. Today they were trying to get at each other from the inside side of the cage--2 of my top girls and one of the bottom girls, Shirley.

I saw this and tried to fold the towel tighter over the top pan of the FN. But when Shirley, 1 of the girls on the bottom, saw my finger she bit it, and when I put my hand in to pet her and try to calm her she bit again--I know stupid. I'm worried that this is a sign of bad things to come during intros.

Does this mean that my new girl Shirley is going to be really aggressive come intro time?
Is all of this a sign of a difficult intro? I don't have much intro experience, so difficulty is definitely not my specialty.

Also, Shirley doesn't seem to be scared of anything, so I fear it might be tough to find a neutral ground that will have her scared enough to neutralize any aggression she might have.

 

[jorats]

Their behaviours through cage bars is definitely not an indication of how they will behave face to face. It's like having a dog behind a fence be super hyped up, aggressive even at a stranger but take that fence away or leash and the dog is normal, welcoming even. Same goes for rats. You'll know soon enough how your girl will be.