I am no expert and I am sure you will get better replies, but I know it is nice to see someone reads your posting. Last winter, I twice saw a lone redwing in the fir tree opposite my second floor window. It was about four pm, both times, just as the light was fading.As I too am used to seeing several at once, I assume it had got separated from the others. It hunched up on a branch and , as dusk fell, it retreated to the inside of the tree against the trunk. Obviously, I couldn't see what happened either time, and heard the owl at night, so wondered, but was amazed when it happened twice in three weeks.I hope it went off at daylight to join the flock,but who knows? The same "slowcoach" or another one??