I have a friend who is starting to get interested in bird watching. He has a wonderful memory, and is really good at describing what he has seen. Last night, we were out to dinner, and he started asking us about a bird he had seen the previous evening. My wife and I were scratching our heads, because he was describing something we had never seen (among other field marks, a white stripe on the underside of the wing, front to back. Other birders are probably saying "Oh that is a ******, but we had never seen one).
Anyway, my wife said we'll need to hit the books when we get home, but I pulled out my WM device and started entering what we knew (location, wing shape, size) and it quickly narrowed down to a handful of birds, and one was obvious from the picture, a Common Nighthawk!
Alan