The Ruby-Crowned Kinglet is a common bird around here during the winter. They're tiny birds and they flit around so quickly they are hard to see with binoculars, much less with a camera. And most of the time it's hard to tell why they are called "ruby-crowned" because there's not sign of any red at all. Their crowns become apparent when they get riled or agitated.
I got really lucky and was able to keep the kinglet in view long enough to get some great close-ups, AND he's got his crown up!
Ruby-crowned kinglet flits and displays