I looked out my mindow this morinng to find a duck swimming in my
pond... I thought it was very cool to see.. After a few minutes he
flew away.. within an hour he came back with a friend..

Again thought it was pretty cool... then I thought to myself.."What do
ducks eat?" Should I be worried about my koi? As to what kind of
ducks they are, one was brown the other had a green head.

Thanks