I have a HUGE Delaware rooster who has suddenly become aggressive. I raised him from a chick. I didn't cuddle him but I've handled him, hand fed him treats. I've lost most of my hens lately I believe due to stress (neighbours dog) and one I think he injured because he was too big for her. Now there is just him and his sister left. (I'm not sure if chickens know their siblings but he doesn't seem to be mating with her) Last week I let them out and was bringing the food pail to the coop when he attacked me about three times. I thought it was just for the food. Yesterday I fed them, then let them out of the coop he came right at me and was really persistent. He's also crowing constantly, it's almost nerve racking.