Found in disused railway track
No identification made yet.
No interactions present.
How big is it? Could it be a hen's egg?
University of Edinburgh and Biodiversity Observatory (OU)
Size would be useful. Twangs of Pheasant to me - very rounded ends and a rather olive tone, but could easily be a raided hen's egg.
Flickr pics: http://www.flickr.com/photos/72243477@N00/
Lat/Lng: 51.82, -0.81
OS grid ref: SP821141