Ruby-crowned kinglets typically hover at food sources much like hummingbirds, gleaning insects from the foliage. This kinglet adapted his feeding methods to hover at the bottom of the suet feeder, pecking at suet. Eventually he became more bold and landed on the feeder to eat the suet.
When male ruby-crowned kinglets are feeling defensive or aggressive, they have a red patch of feathers concealed beneath the olive-gray feathers on the tops of their heads that they will expose. If you look closely you can see that he is raising it a tiny bit in this picture.
