I have a rhode island red rooster and 3 hens in the same pen. We have had them since they were about 3 weeks old and they are now 6 months old. My rooster has always been nice and friendly. My 10 year old son can pick him up and he even comes right up to me when I come to feed them. Two of the hens have layed eggs for the first time today and when my son tried to get them from the nesting box he went in for an attack. My husband ran to get him off and he attacked him also. After things calmed down, I calmly went near the pen and he ran straight for me trying to attack. I know he is doing his job in protecting but he is also aggressively over fertilizing my hens. It seems like he is doing this every five minutes and even grabs their combs and shakes them with his beak. Their back feathers are ruffled. He has become a big bully! What made him turn so mean? It's like he flipped out. Do all roosters go through this? I'm wondering if this can be just a phase or will he probably always be mean now? I have read some things on here about Rhode Island Red Roosters being the most aggressive. Just wondering because I want a rooster to fertilize their eggs for the incubator but will not put up with being attacked or my hens being bullied. We put him by himself in another pen for now and if most roosters in this breed have tendencies to be mean then I don't want to try to get another. Just wondering some of your opinions....Thanks!