Rusty Blackbirds are often gather in small flocks in winter, sometimes mix with Common Grackles, Red-winged Blackbirds and European Starlings.
The Rusty Blackbird has undergone one of the sharpest and most mystifying recent declines of any North American songbird. The North American Breeding Bird Survey estimates that populations declined by 6.2 percent every year between 1966 and 2010—a cumulative decline of 94 percent.