Mono Monday ROCK

My contribution to this weeks challenge.  This rock sculpture is in the middle of a rockery in the Walsall Arboretum.  It is rather strange but cleverly done.  At first glance I thought it was a fish and a duck, but viewed from another angle it looked like a serpent that coiled and writhed all around the rock.  Could not find any information about who made it, or what it was called.

I have included a coloured shot , which shows it better in it's setting.