Sound Waves: nothing they are silent and cannot be seen to the naked eye Waves of water: it all depends : ))
They are big mammals that sound like really big echoes in the water as if some one where moaning the letter "M".
I think it depends on the breed. Like the South African Jackass Penguin sounds like a donkey. or u could think of diff. things cause you are a a smart kid and you could be president
A honking kind of sound