This question is inspired by the question of @Sue on the peripheral vision of squirrels. It is a much less appealing question, but I figure if we can ask about animal behavior at feeding stations, my question is OK.
I too have an on-ground feeding station for chipmunks, squirrels, the larger birds and whoever else comes around. Lately, a very skittish juvenile fox has been a participant at the feeding station. He or she shows his appreciation for the food by leaving a calling card on the patio. Terrible table manners!
We have seen foxes running through the yard from time to time for decades, but this is the first juvenile, the first to feed from the patio, and the first to leave a calling card. I see him/her in the morning around 08:30 after I put out the critter food, and (s)he has left sign overnight. The other critters do not bother him, and if I am motionless, he ignores me, but at my first twitch, he retreats, but sometimes comes back after a few minutes. He looks healthy. Foxes have denned in a neighbor's yard for years -- less than 1/4 mile from us.
Why is the juvenile fox defecating on my patio, and is there any tactic I can employ, short of chasing the fox off whenever I see him (e.g., placement of the food) to avoid having to clean up after him/her?
Addition in Response to a Comment: As @Charlie Brumbaugh suggested, I read a related question and its answers on gardening stack exchange, but did not find a useful answer there. The question involved a lawn, mine is about a patio. The OP said the poop was runny and sticky; my fox's is solid and well formed -- I find it easy (but tiresome) to pick up with a paper towel. The link one of the answers gave to possible answers is broken. Another answer recommended trapping the fox, which I will not do. Another recommended a product with a horrible stench. Another recommended getting big cat poop or urine from a zoo; I know from experience that the National Zoo will not give away big cat poop -- it is Federal Government property! (Long story.) As for having a man urinate around my patio (another answer), I'd rather have a neat, localized piece of poop. Bottom line, the related question did not give me any help.