I was the opposite, last year everyone ate with no problems.

I actually got really lucky on the mouselings, because I can't get live baby mice here. I had purchased a couple feeders for a picky eater, and one was noticably pregnant. I kept her, and a couple weeks later I had a few extra meals for free. I didn't think I had a chance of getting a babies, but it was worth a shot. It worked out VERY well.