Anti-social Distancing

We glanced out of the window yesterday evening and spotted something unusual and white; this ewe and her lamb had appeared in the field.  They were standing a bit apart from the other sheep which are all brown and it soon became clear that the existing sheep were not pleased with the situation.  They started chasing these two around and the 'teenagers' started to get a bit bold and were head-butting the ewe in the bum.  Up and down the field they went, with these two not getting a chance to settle anywhere.  After a while we stopped watching and by this morning it had all calmed down but the new occupants appear only to be being tolerated; they aren't being allowed to join the flock proper.