To refresh your memory, here again is the photo for Bird Quiz #1. Read no further if you still want to have a shot at identifying these birds.
I had been actively birding only a week or two when I took a trip to Yellowstone National Park. There I saw and photographed a bird just like the bottom bird in the photo. I thumbed through all the pictures of sparrows in my brand new field guide, but couldn’t ID the bird. I filed the photo under “to be identified” and forgot about it.