When I sit behind my desk, I have a nice view from my window. There's nothing special outside, just a road and houses. But there are also two large trees just in front of my window and regularly I can watch birds landing on the branches. This is how I got to witness a little dispute between two jackdaws from a front row seat
The first one was sitting on a branch minding her own business when the other one sat right next to her (I obviously don't know their sexes, but for this story let's assume the first one was a female and the second a male). He started to fondle her neck with his bill.