This is why I always click Wikipedia articles linked on HN. Gold. I wonder if this has anything to do with the way chickens use their eyes too. They're unable

This is why I always click Wikipedia articles linked on HN. Gold. I wonder if this has anything to do with the way chickens use their eyes too. They're unable to move their eyes to account for movement so they instead repeatedly move their head once their body has moved more than a threshold amount, resulting in the typical strutting motion of their head.