When ducks swim , they push out their feet back in a kicking motion so that the webbing catches the water and pushing it behind the duck .
(ducks; swim; ) (they; push out; their feet; back in a kicking motion; so that the webbing catches the water and pushing it behind the duck; T:When ducks swim) (the webbing; catches; the water) (the webbing; pushing; it; behind the duck)
ducks they the webbing the webbing
swim push out catches pushing
their feet back in a kicking motion so that the webbing catches the water and pushing it behind the duck T:When ducks swim
the water
it behind the duck