We have a backyard pond about 12 ft across and 30" deep with a 30 foot stream connecting and a waterfall we use for filtration. It sits under 2 large oak trees with tree houses and a 35' walking bridge connecting them. While in the back yard today, my wife found 2 ducks. Greatest thing ever! Not the best pic but I was afraid to scare them off. We are backed up behind a noise wall to the interstate, how they found our little pond is amazing. We saw two like in April last year and are hoping these are the same pair and will visit every year.