Unknown Poo

Unknown Poo

Observation - Unknown Poo - UK and Ireland. Description: I've no idea what produced this stool sample! It was found in a sheep grazed meadow by some woodland. Wood Mice, Foxes, Rabbits & Muntjac frequent the meadow. Circular cross-section (approx diameter 6mm), length 3.5cm. White coating with brown 'mess' in

I've no idea what produced this stool sample! It was found in a sheep grazed meadow by some woodland. Wood Mice, Foxes, Rabbits & Muntjac frequent the meadow.
Circular cross-section (approx diameter 6mm), length 3.5cm. White coating with brown 'mess' inside. Would love to know what left it behind. I'm guessing a mammal of some sort but I suppose it could be avian? Many thanks
EDIT: Updated "Group" to Birds rather than Mammals