Ducks On The Wall Poem by Bob Gibson

I remember going to me mothers house, an on the living room wall
there were three ducks descending, heading for a fall
the biggest duck was always first, he was the one in front
then came the middle one! and the next one was the runt
I think they were mallards! from their coloring so to speak
white rings around their necks, and yellow painted beak
from a child i was puzzled, the last duck's beak was brown
why different from the other ducks in their eider down?
i asked my Dad about his beak, why different from the rest?
its because! that duck, cannot stop, as fast as all the rest!