Pals?

Noticed this Starling sitting on the back of this sheep and then it would fly off sit on a wall , fly back to the sheep (same sheep) , then flew around with another Starling landed in a tree for a while and then went back to the sheep ( same sheep) and it was still there when I moved on. At no point did the sheep seem react but it obviously did't mind. No sign of the Starling feeding on anything on or around the sheep just getting a free ride across the field or a different perch but no higher or better then the wall a few yards away. I reckon they are just pals happy in each others company !