This is for all you good folks who don't have many hummers, but hope to someday. It takes a while to build a resident population, I've been working on mine for over 15 years, so be patient. There's a formula for calculating the size of your group: multiply the birds you see by 4 for a minimum, and by 5 for a maximum. I think all of mine show up just before dark, it's a jaw-dropping traffic jam! In about 5 or 6 weeks, members of the Northern Tribes drop in for refueling, and the population doubles. It's somthin' to see!! They hang around for a week to 10 days, then leave and take most of mine with them.
Here is a link that might be useful: Turn your speakers on!!