Wow great pictures
fantasticly detailed and sharp (and in focus which is better than most of mine), swans are really aggressive towards one another, here are some pictures of the swans at Martin mere not as detailed as yours but you can get the picture.
Feeding time at Martin Mere and one swan turns around and says "hey stop pushing"
The other swan honks back something unmentionable and....
Beutiful but aggressive and dangerous birds
Poirot
P.S. Are all swans really owned by the queen??