The toughest birds for me to photograph are cardinals. I've been trying to snap a picture of one for about six years now, and they're so hypersensitive to sound that they always fly away before I can take the shot.
At least they are unless you distract them with a couple pounds of birdseed:
This one is a bit crooked because I was so excited that I fumbled the camera.
This is the shot I wanted. Beautiful little guy.