When Rummy first came home, he would chase the chickens if he was offleash in the yard. But Rob or Mum would yell at him "No Birdies" and try to teach him not to do that. When he saw the chickens more often, he started to calm down more and would not chase them so quickly. If the humans knew the chickens were grazing nearby, they would only let Rummy out on a leash so he couldn't chase.
Rummy is on the leash, and made to stay calm and at ease while the chickens approach close.
Rummy is on the leash, but he is free to sit or lay down calmly while not being held on leash by Mum. The chickens are gaining confidence around him because he is calm, and he can observe them close by and as they both gain more and more trust as the days go by, he will be able to satisfy his curiosity about these birds.