I agree, had call and stick with cotton balls or feather, but not necessary. They will know where you are as soon as you start calling, the feather idea gives you a diversion though.
If you want to make a call, I can show you if you'd like, takes about 10 minutes of you have the "stuff"
You will need a 3-4" piece of 1/2"-3/4" pvc pipe, no trespassing/for sale sign, or similar thickness material (just need a piece) and a rubber band. Tools needed hacksaw or any saw in a pinch. Made bunch of these, not fancy but each one has it's own sound and will be new to the yotes.
“Never be afraid to try something new, or diy. Remember, amateurs built the Ark, professionals built the Titanic”
Friends don't let Friends drink and post.......
The first 5 day's after the weekend, are the hardest....