This morning I set up a camera on a tripod near the birdbath and after about 20 minutes caught a "Dusky Thrush" on video. He stayed over five minutes, drinking and preening and checking our mikan (mandarin orange) tree for fruit.
The Dusky Thrush is a Siberian bird that migrates south to east Asia in winter.
It does get down to freezing here at times, but only briefly in the early morning. Days are well above freezing. So I empty the birdbath at night and refill it in the morning.
Note: Sorry about the traffic noise - it was "rush hour" - and there is an odd electronic noise. The camera was right under the telephone lines, so perhaps the electronics picked up a data stream or something from there.