Late yesterday afternoon a flock of a dozen or more Yellow-rumped Warblers and at least one Golden-crowned Kinglet visited my yard for a short while. It was hard to count because they were in almost constant rapid motion. Plus I was trying to get photos.
Here is the kinglet.
One of the yellow-rumps had something sticking out of its head. Not sure what it was. Here are two photos of that bird in very different light and one of a third yellow-rump.