Ruby-crowned Kinglet

I shot this earlier in April when I was using the older 500mm lens (I was feeling lazy/sore and wanted to go a little lighter than my 800mm).  Ruby-crowned Kinglets are always hyper and getting one to stop still for a moment, much less one where I can frame it and focus on it in that timeframe, always involves throwing out at least 90% of my attempts which are usually a comical mix of subject blur and fragments of tail feathers as most of the bird has already left the scene.

Although in this case the fact that I was shooting prior to full leaf-out (due late April) raised the odds slightly.   The 500/4L is a little faster to focus than the 800/5.6L which probably helps.