Very strange poo (icky warning)

Ok, 4+ year old black rat, last feedings as follows:

8/20/08 25
8/24/08 8 x2
8/31/08 25
9/13/08 refused

So, tummy should be fairly empty. She ate a 9g hopper tonight, but while in her feeding tub she did this. Each lumpy looking thing is a clearish, sort of hard capsule with various whiter specks. Is this normal and just not something I've ever seen her do before or do I need to be concerned?

Thanks everyone