What is it? Very young Orange-crowned Warbler
Now that someone has correctly identified this newly fledged chick, I'm putting the name here. Actually, I'm not sure if it qualifies as a fledgling, but it was not in the nest when I found it hidden in a Scotch Broom bush. Location? In western Yamhill Co., Oregon, at about 700 ft. elevation in the foothills of the Coast Range. It is about two inches in length, beak to tail.