Birds behaving badly!

The blue tit had been eyeing the nest box up, then along came a great tit who did the same and went inside!  Well that made the blue tit mad and he flew up to the hope and hammered on it.  When the great tit came out he went for the blue tit (just visible behind the nest box in one of the images.  He then returned to guard it!

Thank you for all your kind comments yesterday.  I am feeling better today but still less than 100%.  I have caught up on some of the art challenge and photos.