More Hummingbirds of Winter, Mom Edition

So a hummingbird showed up right on schedule, day after Christmas. I stepped out on a cold morning to find it at the feeders I’d thoughtfully hung around the parking lot at my unit. Obviously an immature Selasphorus, a western hummingbird, but I couldn’t figure out which species I was dealing with (Rufous? Allen’s? Broad-tailed? um, Calliope?) until this…