FYI went to Mexico City last year and you can find replica death whistles all over the place in little shops. Also some eagle sound ones, jaguar growl ones, etc. Had a lot of fun with the kids getting a bunch of different ones and they make nice little mementos! Takes a bit of practice to get the sound right, but they can be pretty loud!

I went in thinking... haha it's a whistle, how bad can it be.

But jesus fuck that's actually a super terrifying sound!