We tend to think about corals as stationary animals, almost plants, but they do have a free-swimming stage when they are very young. A team of scientist working in the Caribbean Sea has now found that during this stage, the tiny corals find their way to suitable homes by listening to the distinctive sounds produced by reef dwelling animals.

The thresher sharks belong to genus Alopias and are famous for their huge caudal fin. In some members of this group, the caudal fin is as long as the rest of the body. Even the name of the genus, Alopias, is a reference to this distinctive body part – alopex is the Greek word for fox.