A wise advice from me to you: Always watch your vacuum robot while it's doing its business - I just came back into our bedroom only to find it dutifully dragging the last remains of a fresh mouse carcas from corner to corner... (a gift from our cat). You could really see what path it did take by tracing the slowly drying body fluids of bowel-contents, blood and pus.
It smelled funny, so I opened the window ...
... only for the flys to start coming in.