In the late 1970's I had a PMRT that was incapable of letting a piece of trash blow by on a breezy day. On one occasion he took a McDonalds wrapper in a very Goshawk like fashion, pursuing it from below then swooping up to make the capture.
The strangest part was watching him pluck his "kill", until it was fully shredded.
At that point he would walk around in circles checking out the numerous "plumes" looking for the meaty parts that should have been around there somewhere.
It took him almost the entire season to give up chasing paper, or the occasional leaf. Silly Birdie.

Live and learn is still applicable.