You guys always want those new fangled implements. I have one of these that I have modified to use PTO to power it. It's got to be 30 years old. You can see the fingers that rotate to pick up whatever you go over.
https://www.youtube.com/watch?v=kXgqzON0nj8
https://www.youtube.com/watch?v=kXgqzON0nj8