Lucky you! We've had both yellow & ruby crowned kinglets visiting just the last few weeks here in southern Ontario, Canada. Our cat unfortunately, killed a yellow. That's when we looked them up since we hadn't seen these little birds before.

My husband was able to rescue a red our bad cat was carrying around in his mouth. It flew away unharmed. Cat wears an obnoxiously-loud bell on his collar now which has so far prevented him from killing further.