Back in the last sixties my dad purchased an electric crow caller. It was a record player with a speaker that ran on 12 volts. Lots of fun. We could only fool them the first day. After that they ignored the call.
Still in the late sixties - a civic club in one of the small towns around Amarillo used to have a crow shoot as a fund raiser. We would arrive in the late afternoon, pay, and get set up. They set everbody up at a roost and we would shoot them as they arrived. They scheduled it for a full moon and we would shoot for a couple of hours after Sunset. Lots of fun.
Best,
Mike
