Another look out the window :
This time a male cardinal -- yes, it was a cardinal again
-- he was pecking at something on a tomato plant/branch. Thinking it was a fruit, I was getting ready to bang on the window in hopes of scoring it, but I didn't see any color, only green. I looked on the ground too but no sign of fruit bits or skin. It really looked like the bird was pecking at a particularly thick stub of a branch with nothing on it... Then I saw it: it was a FAT HORNWORM!
...I just harvested a couple of fruits from that plant yesterday, too. Never saw it.
After a couple more blows, I guess he finally got the caterpillar to let go because he grabbed it and hopped down to the ground.