Yep, they'll go broody, rooster or not. Even on golf balls, or plastic eggs, a rock, nothing at all! When the hormones say they're to be broody, they go broody. I've often heard broody behavior called "zombie pancake" and that's pretty descriptive of what mine turn into. Hunker down low on the nest in a pancake and zone out like a zombie. Don't want to be disturbed but none of mine will actually bite or peck me, they just protest if I do. Except one, she's in the habit now of letting out an ear-piercing shriek. Crazy thing.