Could they save the world? Researchers discover the secret of the whale’s soothing song, as scientists warn that our underwater antics may soon drown them out for good.
Eureka! Mystery of how whales sing is solved
Orca-stra: Some whales have evolved a specialised "voice box" which allows them to sing underwater. Glossary
Baleen whales - Baleen whales have baleen in their mouths, which act like big sieves to filter food from water.
Melancholy - A feeling of sadness.