I do talk to them when I photograph them. I have no evidence, but I think
they can recognize my voice. They don't seem to mind me, but if others come
near they stare at them, do the head back and forth behavior and sometimes
chirp.
I have been donating my images for publications out there and for the DFG to
use or display.
After watching for hours at a time (sometimes 8 hours), I have gotten to
know their calls and their behavior - even their personalities. With the
new 1D Mark IV coming out soon, I will then video them which tells an even
greater story.
DeeDee