Yes, but the cowbird is well-mannered and carefully groomed at other times. We really should have a better name for them than "cow bird." Let's see, a cow is a Bos primigenius. How about that - a Bos primigenius bird?
They've made nanny contracts with those other birds, you know. The adults like vacations, is all.
The male cowbird, if you catch him in the right light, looks like his head was dipped in chocolate. It may have been - dipped in chocolate. They are always found in the most pleasant surroundings, like to distance themselves from other birds, and never bother to mention the privileged start in life that they've enjoyed.
Steve