Whilst at Manton Bay (Rutland Water), we watched a Grey Heron move a Little Egret out of its territory. have a look at the photo sequence of events. 
“I’m just not even gonna look at you!”
I“If I flap my wings about a bit maybe he’ll get the idea!”
“Ok, ok, I’m going!”
“This’ll do at least they look a bit more friendly!”
“Ooooo, heck, obviously not far enough! I’m off!”
“Finally ! He gets the idea!”