One of the reasons I was not sure if i wanted ducks is because I knew they would eat up my tadpoles, reducing the amount of native frogs I have in my pond. Before the ducks ever arrived I had started to build a frog safe place along the edges of the pond - by taking small dead hemlock trees and piling them up. Still though, i have way less frogs then normal because much of what i built was moved, decayed, or gawd knows what during the winter freezes..... and the ducks came in to massacre what was out in the open. I was excited to still see in some of the hemlock habitats i built, tadpoles and a group of frogs all in one space. So i took that spot, and made what was a froggie shack, into a frog multi-plex mansion!