We have three feeders off the back porch, and my dad keeps them filled throughout the day, at least three fillings per day during hummingbird season. One feeder is clear, one is nearly sapphire, and the third is strawberry. It's the strawberry feeder that causes all the problems and fights. One large hummingbird that my dad refers to as 'Boss Hog' dominates the strawberry, sits atop its supporting rod, and fights off any challengers. He sits there all day long and only has to protect his berry when the other two feeders are ready for refilling.