We have a very young flock and a young Roo (just happened to be the only Boy that lived out of the bunch)... He is a Jersey Giant though and starting to mature, he is very defensive of his hens and make alot of noise (they free range about on 2 acres)-- I guess what his purpose is, is to sound the alarm and then the Big dogs come running (they kill lots of things, and protect the chickens)... SO he is mainly to alert the dogs, allthough in a pinch I have seem him go running at the cat (which quickly gets outa his way...)...