The herons around here are definitely drone intolerant! As soon as they see it they do an afterburner takeoff. And they can see well. What I do is zip in from the other side of the house, zoom down to the ponds about 200 ft away and try to video them flying away. It's very difficult, watching the heron, watching my P4 and watching the screen, avoiding trees, and flying ... or trying to. Once I crashed into the top of a tree chasing one, but my P4 miraculously survived unharmed. And buzzards? If you get too close they do a nose dive. At 300 ft it is nearly impossible to get behind one so I can follow it via the screen - extremely difficult at that altitude to match altitudes. I have one frame with a buzzard in it, but I'll keep trying. (Been flying my P4 since June, and RC planes & helicopters for years before that, so I'm not a total klutz at the controls.) When I flew ultralights there were several times I could fly formation with geese and once with a hawk (at 100ft or so). With a drone it's much harder.