We have gradually had an increase in numbers of Hummingbirds over the past 4 years. We are not in the migration period as of yet but we have a heard / flock / a bunch of birdies. We are going through almost 2 gallons a day now. Some will say that it is a lot of work, we feel like it is well worth it. When they are all gone for the year we feel like something is missing. We estimate 150 to 200 birds in the yard these days.