Sincere apologies, I missed the duck, and the answer was a ducks quack. Well done Ana for Duck and Linsco for finding the urban myth that a ducks quack does not echo.
Last week we were staying at Warners Gunton Hall. We had a suite with two rooms. MrsP asked me to answer her mobile phone which was ringing, her ring tone is a duck quacking --- it wasn;t her phone it was two ducks in the living room !. The lake was nearby. The following morning we were woken by two ducks pecking at the window.
I'll play Mr WB but won't start it off as I still have a few admin tasks to complete this afternoon I'll check back in a little while to see if you have started