Guineas

A few weeks ago my husband picked up 6 guineas from Tractor Supply. They are straight runs, so we don't know if they are roosters or hens. The guineas are supposed to be good for alerting you if there is a predator. I wonder how noisy they will be. 
They are really skittish, unlike the other chickens we have had. They do not like to be held at all. When you visit them they all run to the corner and pile up on each other, so it was hard to get a photo of them.