When I was a little girl we spent our summers in Madison, Wisconsin. A necessary ingredient of those summer trips was a visit to the Madison Zoo. I have no idea what the zoo is like today, but to my 6 year old self it was a magical place. Even as I type, countless visuals are streaming through my head.
My brothers would whistle through a blade of grass between their thumbs at the rhino exhibit and make the rhinos go nuts from the sound. I, of course, thought it was the coolest and scariest thing ever. I tried and tried, but could never get it to work.
Why do I bring this up? I just heard an elephant in my backyard: my twelve year old has figured out the trick to whistling through a blade of grass.