What a shame I missed this post :-[ Grans will be well on her way to her daughter's now for a few days. Other US friends had this happen & they bought some auto-adhesive non-reflective plastic stuff for the window...can't remember if the Cardinal was trying to attack its own image or mate with it ::)..probably the former this time of year? :-\
They're the most beautiful bird. I've a pic sent me last Feb...woodland scene, high trees heavy with snow, all grey and white and there, high up in a tree, a flash of crimson 8)
Shades, remembered you when I was tasting that week's Special Brew at The Top of The Hill in Sept :D