We had looked for the RUBL here earlier in January, but had not been able to identify them conclusively. This time, we saw eight birds (two males and six females) in the boggy area just west of the greenhouse and had enough observation time to be sure of our identification.
The first shot shows the boggy area that the birds forage in, with a few birds pecking at the water's surface. I am not sure if they are after insects or vegetation. This boggy, flooded-woods habitat is certainly correct for this species and helps distinguish the birds from the somewhat similar Brewer's Blackbird which would be found in open fields.