I know it was fresh because I buy my rats one at a time from the local pet store, not in bulk. They had just gotten them in the day before I bought it. It's too late. She's long since abandoned its carcass in the water bowl. She pulled away into her hide as if to say, "Ew. I'm not eating that now." I just have to wait until either my boyfriend gets back or my one-month-old goes to sleep (I've been trying for over an hour) before I can start cleaning.