What make its feet useful for swimming?

The shape of a duck's feet is critical to its swimming ability. The feet are webbed, which means that the toes are connected by a thin layer of skin. This webbing creates a large surface area that helps to propel the duck through the water. The feet are also strong and muscular, which allows the duck to paddle efficiently.

In addition to the shape of the feet, the duck's legs are also important for swimming. The legs are long and powerful, which allows the duck to take powerful strokes. The legs are also flexible, which allows the duck to change direction quickly.

The combination of the webbed feet and strong legs makes the duck a very efficient swimmer. Ducks can swim at speeds of up to 20 miles per hour. They are also able to dive underwater and swim for long distances.