I am unsure about who the phantom poo-er is. We have pet rabbits so I'm hoping it's not a fox. However, the poop don't stink.... so I don't think it's a fox or cat. Wood pigeons sit on our fence but I think the poo is too big and solid for a pigeon. Perhaps it could be an owl, but I can't see any feathers or bones there in it. Whoever it is they have been doing a lot of poo recently! Please get your sleuthing caps on :)