IUCN Conservation Status: Vulnerable
Rusty Blackbird is one of North America’s most rapidly declining species. The population has plunged an estimated 85-99 percent over the past forty years and scientists are completely puzzled as to what is the cause. They are relatively uncommon denizens of wooded swamps, breeding in the boreal forest and wintering in the eastern U.S. In winter, they travel in small flocks and are identified by their distinctive rusty featheredges and pallid yellow eyes.
Song consists of two or three notes, followed by a higher, rising note, like the creak of rusty hinges. Call note is a harsh "chek."
All About Birds Blog, Help Scientists Find Out What’s Happening to Rusty Blackbirds, March 2014.