Birds off water trampoline methods?

[winni83]

We has that same problem with ducks pooping all over our poly and before that wood swim raft. When we replaced the swim raft with a water trampoline, no more ducks or other birds go on the trampoline, at least so far in the past few years. Don't know if it is the increased height above the water or that they don't like the jumping surface. Sure hope that continues.