Periscopes - The First Submarine Weapon

The allies tried to train sea gulls to deficate on the periscopes of few boats. How did it go? It didn't go so well. The main problem was twofold, and they couldn't tell the difference between friendly subs and enemy subs. And also, they don't tend to go out to sea very muchntend to live on cliffs where there aren't so manyan submarine round tebasi.