Aging Sculpture

Everything gets older, hell even the stone that we carve our memorials is aging in it's own particular way; it's eroding, it's softening, the figures may be blurring, fading, sometimes to the point of losing the shape
of whatever it originally depicted.

What is it besides likely bovine?

When Sid and I visited York in England we went to the old mediaeval cathedral there, York Minster. I was hoping to wander around the outside of the building and take photographs of the figures on the roofs and walls. Unfortunately the grounds were largely gated off while extensive restoration was going on and the only figure that was close enough to me to photograph was this particular one, on the point of fading to obscurity.