Behold — I shew you a mystery. We have several hummingbird feeders in our yards, some of them mounted on metal shepherd’s hooks. We’ve learned that the only hummingbird feeders worth having are the ones with a water dam in the top, a sort of cup that holds water and keeps ants from getting onto the feeder. I have to keep careful watch on the feeders, replenishing the water in the dams because it not only evaporates, but also because some of the smaller songbird will drink the water in the tops of the feeders. The other day I must have missed checking on one of the feeders, because when…