My mother-in-law remembers the kapparah tradition in Poland. Early in the morning of the day prior to Yom Kippur, a fowl was whirled about her head, while she thought about turning over a new leaf. Her father would whirl a rooster, her mother a hen, and her brothers and sisters a pullet or a cockerel. The ceremony was repeated for each child. She was always frightened by the fluttering feathers. After the whirling, her mother would race to the shohet and have the fowls ritually slaughtered to make food for the meal before the fast. All the fowls would be cooked, and any extras given to bachelor relatives or to the poor. Chicken soup would be made for the kreplakh and the boiled chicken eaten as a mild main dish.
Yemenite Jews also eat chicken before the fast of Yom Kippur, but much earlier in the morning, at about 10:30. Their soup is dipped with the kubbanah bread.
Note: Making a children's version of hawayij is a great introduction to Middle Eastern spices. Take the children to a spice store where they can pick out the spices themselves. Hawayij is basically a combination of cumin, coriander (omit if using fresh), curry powder, ginger, black pepper, and turmeric. Add spices according to your children's tolerance for strong and unusual flavors. You can omit them altogether if you wish.