Have you ever seen a window (or a glass door) where a little kid smooshed his face into the glass, and left a skin-oil print?  I went to a Doctor, yesterday (I'm fine, thanks for asking).  Which means I spent a goodly amount of time look out the window.  The "print" I saw was a good 6 feet off the ground, and a perfect image of a rather large bird (think Blue Jay).  I was astounded.  I could see individual feathers at the wingtips.  I could see the tip of the beak.  I was also depressed.  From the impression of the head, the bird struck with it's beak straight up.  I wouldn't be surprised if it broke it's neck.

Later, watching the feeders outside another window, I saw a Cardinal with a weird wing vibe.  Literally.  The bird held it's wings almost completely closed, and vibrated them.  I didn't get it until this bird approached another cardinal.  The other bird was adult, and female.  When the 1st bird started it's wing-vibe, it also opened it's mouth and stretched toward the adult female.  I'm pretty sure I was seeing the Cardinal version of "Hey, Mom!  What's for dinner?  Dorm-food sucks.  Can I bring some laundry by?"