We have four hens (Australorp, Barred Rock, Speckled Sussex, and Golden Wyandotte) and no rooster. Our Wyandotte, Eliza Doolittle is our unofficial rooster but only acts as the lookout for danger. When a hawk dove for them while free ranging under my supervision (I was standing only five feet away), she broke out into the loudest egg song you ever heard and they all scrambled for cover as the hawk swooped past. I never saw it coming and could have reached out and grabbed it. This morning at 5:50 am she did it again, which got me out of bed in a flash, as there is a coyote in the neighborhood, attracted either by my girls or the neighbor's pit bull on a cable run. I don't lock them in at night (they have hanging vinyl strips that part for them to go in and out since the door slides towards the inside of the three foot tall run where I can't reach it) but they are reasonably secure with their mobile coop with hardware cloth run and 100 sq. ft. mobile run butted up against each other. I do worry that something might force its way between them, lift or dig under the heavy run, or tear through the deer netting roof. I guess that I am thankful that Eliza would let me know if they tried.