These birds live in Central North America, from California to Illinois laterally and Mexico to Canada vertically. They are colonial birds. During the breeding season, a male may have multiple female mates. In the winter they mix into flocks with other blackbird species, like Red-winged Blackbirds and Brown-headed Cowbirds. They like to eat seeds, grains, and insects.
In this video, you can hear that these birds have a really cool call! Some people describe it as a "rusty gate opening."
(For some reason my computer isn't letting me format this video the way I want, so it's a bit lower quality. Sorry. :( The best I can offer is full-screen at 720p.)
My sources: 1, 2