Alone?

What would Gerbil TV be without gerbils?

 I looked in one of the cages and noticed Mama Gerbil looked lonely.

I looked all over, but the kids were no where to be seen.

Oops.  Spoke too soon:

They just popped up, though if I look close enough at the previous picture I can spot a tail in the mass of pink bedding.

Well they are rodents.  So what do they do when you get their attention?

Alice