What is it?

I spotted something white down the field a few days ago, it was with several pheasants and they were driving it away, I am still not sure what it was.
Hubby had the tumour removed from his bladder, has had a C T Scan, came home two days later and is doing well, we now wait for the appointment to get the result of the biopsy. He cannot drive which makes it a little difficult, I gave up driving a few years ago. We are very grateful for the help of the daughters and son.