The longest running peregrine falcon migration studies have been done by a group of falconers.
Here is their website:
I just spoke with Bill Seegar, Ph.D. He is one of the group who just finished their 40th year of migration studies of peregrines. We were both agreeing as to how anyone involved in the peregrine recovery program were falconers at some time in their lives. I sort of say, once a falconer, always falconer, whether currently practicing or not.