Both my cats are neutered (and have been for 10+ years!) so if it were a fetus, it definitely didn't come from them. I think willowy is spot on about the stomach thing, seeing as my dwarf hamster escaped her cage at some point and I didn't notice until after this was posted 128531 I've had her...
My cat is 16 and most likely has some form of cancer (we're waiting on lab results to come back.) He's also hyperthyroid. This morning, I came out to two things on the ground.
I don't know if these were vomited, passed, or what. One looks like a weird kidney bean (tan and smooth, with a...