via the lens wrote:
Hi, just a note about what happened when I photographed an owl near my home, maybe 100 feet away (not too good on distances). I was using a 70-200mm lens but the reach was not far enough. So, the next day I took out my longer lens, a 150-600mm. That night the owls moved, babies and all. I felt terrible that I had, obviously, threatened them. I think they have built-in memory regarding guns and the tripod and long lens most likely reminded them of a gun. A very nice shot of your owls.
With due respect owls are birds with not enough intelligence to know if a rifle is pointed at them. Being totally illegal to shoot in all of America I doubt that many owls, eagles, hawks or similar bird are even aware of firearms. If the birds were near your home is it possible that other people have been in the area as well as you?