That's the sound an orca makes

Michael was giving Amelia a bath.  She was prentending she was a dolphin.  Michael told her when we go to Sea World she will get to see dolphins and killer whales.  Amelia asked him what is a killer whale.  Michael said it was an orca.  She then tooted in the tub and told Michael that is the sound an orca makes.  She was so proud of herself.