I don't really know alot about hummingbirds other than they are interesting to watch and they EAT/DRINK all the time. I should google them and get more info. Each year it seems as soon as I put food out, they appear from nowhere. Just one day the feeders are filled with them. Four turn into eight real fast. They seem to be quite territorial and spend more time warding off the others than feeding. So I just keep boiled sugar water on hand because it gets to the point that I will fill 2 feeders every other day. I know there are people that literally have swarms of these little buggers around! I have seen the pictures. I don't really want feeding them to turn into a job, so I am happy with the eight or so that I have. And frankly, Felix can only handle so many in His window. If you have any info that I need to know, please share.