We see many many ducks in the pond near my house.
I don't know where they came from.
I saw them last Saturday too while I was taking a walk.
And I saw some people near the pond feeding them the other day.
During the summer season, this pond was filled with a kind of floating grass.
The grasses covered the surface of water too much, so many fish in the pond died from shortage of oxygen.
Now there is no grass on the water and the water is very clear.
