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The domesticated turkey is a large poultry bird raised for food. The modern domesticated turkey descends from the wild turkey, one of the two species of turkey; however, in the past the ocellated turkey was also domesticated. Turkeys are traditionally eaten as the main course of large feasts at Christmas in Europe and North America, as well as Thanksgiving in the United States and Canada, in both cases having displaced the traditional goose. While eating turkey was once mainly restricted to special occasions such as these, turkey is now eaten year round and forms a regular part of many diets.