They move by sliding on their bellies, much like penguins or snakes... They do actually move on what is called their foot.
it rolls
Just like ours.Who ever asked this is a fool,I swear.
You are not allowed to run with the ball in Netball, or very soon you get a very different game. So the simplest way of enforcing this is to ban moving your feet.
Ducks move their feet to keep floating or to swim.