If you have a really good preditor wise rooster, who does his job, keep an eye on his weight.
Because they are watching for preditors more than eating, they can starve themselves.
I have a roo that I have to pull aside after all the hens go to roost and feed him because he dosen't ge enough to...
While the hens scratch and bend down to pick up tasty morsels, The rooster will hold his head up and scan the horizon for preditors, only eatng occasionaly.
If he spots something, he makes a specific noise and the hens dive for cover.