'Ear in the ocean' helps scientists track coral reef health

When a team of scientists listened to an audio clip recorded underwater off islands in central Indonesia recently, they heard lots of clicking sounds. What does it mean?<br /><br />WATCH MORE: https://thestartv.com/c/news<br />SUBSCRIBE: https://cutt.ly/TheStar<br />LIKE: https://fb.com/TheStarOnline