I've got a new little bird visiting my back yard this week, a Blackbird. My visitor is a female. How do I know? Well, because Nid told me, not because they are black. Female Blackbirds are not black. They are brown.
Female Cardinals (Virginia State Bird) are brown as well, while the males are a vibrant red. It's not fair to the girls, but at least they aren't called Redbirds that aren't red.