I live out west and came upon an elk herd one day. I flew over them at a very high altitude, keeping my eye on their body language. I ever so slowly started to drop down, and when I saw them look at my drone, or stop doing what they were doing (eating, sleeping, grooming, etc.) I retreated. I then moved off very far and slowly approached them from about 20' altitude, being equally observant. I found that the high pitched buzz of a drone is NOTHING like anything they would normally hear, so they were very sensitive to it. I got lots of videos of this herd, and they never "ran" away. None of my videos are very close, but with my zoom feature, I was able to differentiate between the bulls, cows, and calves! I know of folks that use their drones to actually herd (harass) deer and elk, which is not only unethical, but illegal here as well! Each state has their own laws regarding this activity so I suggest you contact you fish and game commission to start with so you can avoid prosecution?