Birds sing at the start and end of the day. It is called a chorus and it is full of communication about territory, family and food sources. Such choruses occur under water too, but they are formed out of clicks and bops and the scrapes of creatures under the sea.
Natalie Soars, a PhD Candidate at the University of Sydney and the Sydney Institute of Marine Science, recently submitted her PhD which characterised the sounds that regular sea urchins make and what contributions those organisms make to the underwater chorus.
Listen to Natalie tell her fascinating story to Anne Jones : Off Track, RN : Saturday 30 May 2015 10:30AM and think of the Urchin sounds as background to the Forests of the Sea stop-motion!