Frank & His Pal Keddy in our pool!

When we moved in we were surprised to see that our pool was frequented by a green mallard. He would come in the morning for a half hour then leave only to return in the evening for a second dip. I decided that I would call him Frank. A few days later we noticed 2 ducks although Frank is more of a regular. I just had to snap a pic as I Found it so odd.