Tom does a pretty good impression of a hawk call when he wants other birds to get away from the feeder.
I used to be good at some bird calls when I was a kid. It was important to impress my classmates with something. I was always shy and withdrawn, so competing in anything was difficult.
Then we learned how to dance in the winter, when the snow was too deep for us to go outside for recess. And then, when I got older, I excelled in sports. Which explains my arthritic joints, now.
Then I went back to dancing as an adult. Now I just sit out the dances because I have no dance partner. Go figger. I sure never thought I would live half of my life alone. If I had, I could have prepared for it better.