Definition: Polyodontidae is a family of extinct birds in the order Chordata. This group includes several species, which are characterized by their distinctive feathered heads and wings that are larger than those of other birds. The most well-known member of this family is the ostrich, which was once thought to be an avian species until further studies confirmed its primacy as a bird. Polyodontidae is also known for its unique anatomy, which includes a long tail with feathers on both sides