This pictureis from my parents house in NE PA last weekend. There are 8 hummers in this picture and that isn't all of them that were flying around that night. My mom said someone recently told her to take the highest number of then that you've seen at once and multiply it by 6 and that's how many are around. We had never heard that before and I don't know if there is any truth to it or not. I have a feeder I want to put out at my house, but we have yet to see any hummers here. I'm going to put it out and see what happens!