Partly, I don't want to mess with them in the dark.
Partly. I don't want owls to fly off with it.
I use hand calls quite a bit during the day, but flip on the caller/decoy to take the heat off me.
I never hand call at night, & many times I shut off the caller off to keep them from storming in, & make them hunt for it.
Better chance of a standing shot I believe.
