I tried your suggestions for feeding treats to my roo. First I stood at the door and tossed the meal worms in the direction of the hens. They got the idea and soon were standing on my toes to get the treats. The roo was a little more standoffish, and when I pitched a mealworm his way, he seemed to point it out to one of the hens. Finally, I got him to come close. Instead of dropping the treat at my feet, I held it in my hand towards him. He completely ignored the treat and flew at my hand, talons first. The good news is that the last two times I have entered their pen, he has left me alone. I consider that an improvement. I will have to offer the treats on a random basis, and I expect that will help him see me in a better light. Thanks for the suggestion!