Every year at this time, tiny Golden-crown kinglets sweep through the yard. They're very tiny birds, impossibly cute. Usually they're in groups high up in the fir trees, but this morning I saw three hopping around like ping-pong balls in the driveway and calling to each other in their high-pitched voices. One came within a few feet of me, probably not even noticing what I was. Here's a photo from Birdnote.org.
Here's another, source unknown.