The "deposits" are still there, so went out into the garden with a ruler so you can see the scale.
The thing is, we've lived at this address for 21years next month, and we've never seen anything like these. We've owned dogs over the years, so maybe they are dog-like. Deer, we see plenty. Foxes rarely, and badgers rarely too. Sheep have escaped from the fields locally and into our garden, but the sheep poo is very different to what we have here.
We have three cats, but we never see their deposits let alone see them doing it, but you could argue that they are cat poo ............... but a big cat.
Some years ago when our elderly border collie was almost blind and quite deaf, i would take him for a run up in our woodland. A couple of acres of trees and undergrowth and the dogs we've had have really enjoyed there.
One early morning with said elderly border collie, I saw a cat. It was a big cat, pale dull brown all over and about the size of a labrador dog. It was definitely a cat by the way it moved. Our dog never heard or saw a thing, but I did. It loped away at a gentle run away from me through the bracken and then out of sight. I saw it for all of three or four seconds, but I've never forgotten it.
Maybe it's visited us in the garden?