While playing out in the yard this morning, I was able to get within a couple of feet of the bird feeder while both a sparrow and chickadee took turns eating. The sparrow was more cautious, often watching me from the tree and waiting for me to move a little further away before returning. Here he is peeking at me.
The chickadee was braver, though he did scold me a few times when I surprised him. Perhaps they have less fear because after swiping a seed from the feeder they fly to safety in the tree?