raven! I just thought of this (sorry all) but she was walking where rats walk. Rats walk through poop. worm eggs in poop. another 30 days- roundworm, maybe tape, maybe other kinds that rodents carry (my vet book says CA has eye worm with cats but us on east coast do not yet- we do have lung worm). Anyway- I am sure this has occured to you and raven poops where ron does and he will pick up eggs too..
Grace- thanks for the wonderful nearly video picture for our imaginations! I've told this story before but here goes just for you! On the phone with friend one day (she does lots of rescue work) when she suddenly screams "What the F****!" Turns out a cat she was fostering and had treated for tape worm had puked up a tape worm WHOLE including the MOUTH! She was very freaked out by the size and how the mouth was so visable - the mouth must have let go of the intestines and come up through the stomach for the cat to be able to throw it up whole! Very unusual? I don't know- just glad I didn't see the creature!