While walking along Memorial Drive I heard the oddest noises (VIDEO uploaded) which were something I'd never heard before. I looked around to see if someone was playing some strange new age music but couldn't see a source for it anywhere. That's when I went down to the beach and noticed a flock of Bonaparte's Gulls on a rock spit, something I hadn't seen before. Then they started calling to each other and if you listen carefully at the start of the video you'll hear their 'unusual' sound! lol