Hello bird enthusiasts! I took this photo last week and I have been going back and forth on who this little guy is. I am new to taking photos of birds so these aren't good photos. I believe it is a Ruby Crowned Kinglet or maybe a Dusky Flycatcher. I am in Sonoma, northern California. Taken mid December. He is about the same size as a chestnut chickadee. Thank you for any information passed!