Here are some more Cardinal shots. They are one of my favorite birds. The shots of the bird on the feeder are through a window, so they are not as sharp as they could be.
All shots were taken using the 100-400 f/4.-5.6L IS lens. Some had the 1.4x teleconverter also.
Male and Female together in the trees:
Male on feeder:
I think this is my favorite:







