Human aggression is a personality defect. It will manifest itself, if it is there, sooner or later. Obviously a bird that is familiar with you will not be afraid to invade your personal space. An unhandled bird may take longer to turn and may not be as bad when he does. My birds are...
Roosters attack people for many reasons. Sometimes it is a flighty, skittish rooster attacking out of fear, sometimes it is one that is too dumb to figure out that humans are not chickens. Some are just downright mean. Some have some screws loose. Not unlike dogs. If they cross the line it will...