That's a tough call. It seems cold and heartless to be taking pictures of someone injured or in distress. However, after the picture is taken and processed, there is a record of what happened so others can see it. Imagine if war was considered too horrible to photograph. We would see none of the heroism and suffering, and we would have to rely on movies to get an idea of what war is like. It's the same with floods, tornadoes, fires, and any other natural disaster. Taking pictures lets the rest of the world see what is going on.

I use fill flash on high speed sync from a lawn chair about 8' from the feeder. If you sit quietly they get used to you, ignore you-don't move fast or jerky-lift the camera smoothly unless you have it on a tripod, pre-aimed and even pre focused on the feeder. When they are disputing ownership of the feeder and doing "chase the birdie" they have used my head for a racing pylon so close they circled me under the brim of my hat and I felt air or a wing tip on my ear. A few times I have forgotten the camera and just watched.

As to lens, I usually use my Canon 100-400 but have also used a Tamron 180 macro with or without a Kenko Pro 300 1.4x on a crop sensor Canon for 403 mm angle of view. For your Nikon a similar rig would be 378 mm angle of view. Being a macro the details are outstanding.

I have the same problem. Except that my images are scattered over 7 external drives. I finally started naming the drives and writing on the outside what's on them. That helps. However, I have images from the arboretum, for example, that are sorted by date (who remembers!) on several different drives. They need to all be on one. And I think they should be taken out of date folders and put in named folders, such as "flowers," "scenics," "cactus," etc. I normally recall WHERE I shot something, but not when. What I have started doing is trying to make sure that each image has a title (I can do this in Windows or in LR) while keeping the file name that came from the camera. Keywords help also. It's slow, but Windows can search for file name, title or keywords.