When we lived in Honduras my husband brought 3 chickens home for our kids as pets. We knew nothing about raising chickens, so asked the villagers what to feed them. We were told to let them scratch around the yard, give them scraps, and white rice every morning and evening. We did, and shortly those 3 became 54! They loved their rice, uncooked, and we never had any problems from it. Here in the US, knowing a bit more, we feed them brown rice and it is their favorite treat. I can hear them in the mornings calling me for it! They had only had layer pellets initially, and I read it was best to train their digestive system to handle grains, so started them out slowly. We have never had any chicken with digestive problems from it. Regarding the sparrow story, size of bird (large chicken vs tiny sparrow) related to quantity eaten (pounds of rice on the ground vs moderate amount given by owner) must surely be considered.