Thanks Wolfgang. I got lucky. I went to the place I hardly ever go to and found the area inundated with Kinglets. I clicked away until something stuck. Kinglets are very tough because of the constant movement and many obstructions because of the habitat they live in. As to the ruby crown, I managed few shpts with males head on and the red patch is almost invisible.
Very cute. I've been 'hunting' them too the last days and if I got one they turned out to be female (i.e. missing the ruby patch) or looked the other direction. I like your composition and the bird's pose on this one.