As long as the number remain small, but once the numbers begin to grow it is fruitless.

More or less. Individuals do not live for many years. Individual birds do dominate an area they have staked out and squabble, constantly. If the people want to call the individual a name, unless it is banded and they check, how can they know and who's to argue with them. I could have named one chickadee, that had a white tail, because it was very distinctive. It was around for only a year or two. I was not inclined to do so, but I was not maintaining a garden that might be visited by children. Next opportunity, get the thoughts of the people.

What does that mean, "AS LONG AS SHE STAYS AWAY FROM FEEDERS SHE CAN RETURN FOR TEN YEARS"?

I also don't understand that line. Also, not so common for females to defend territory unless they're nesting.

I have read that hummers live only about 6 years. I have been feeding hummers for 20 years plus. My theory on giving them a long life is to stay away from premixed nectar and food coloring. Only use 1/4 cup sugar and 1 cup of water that has been heated. Keep the feeders in the SHADE and clean them once a week. I only put enough of the mixture in for 3-4 days. It will spoil fast in the heat. You can mix a batch or two and keep in a jar in the frig. I am always amazed how people hang their feeders in the sun. This drives me nuts! It will spoil and besides, would you drink sugar water that has hung in the sun for a few days? Or would you drink from something with black mold on it? Most feeders are red so why do people think they need to put food coloring in it? The premixed stuff and the food coloring has too much stuff that is bad for their kidneys. Read the labels. I've read horror stories on what people 'feed" their hummers. Please keep them healthy for a long life. I don't understand that sign either, especially about the feeders. I do think their offspring imitate them and that might explain the same branch. The male in my garden leaves every year on Labor day weekend. The young hummers and the "Mom" right away try to take over all of his "branches" for keeping watch on the feeder.