Cedar waxwings are the species B. cedrorum and live all over the United States and sometimes in South America. They can be seen year-round in Davis. They eat berries, fruit, and insects. According to Wikipedia, they make "very high-pitched whistles and buzzy trills often represented as see or sree."
These are pretty cool looking birds and I like the noises they make, but they crap all over my car and sometimes on me. I can't park in the driveway anymore. It's like a rain of a bird poo when they're around. —MikeyCrews