Could they save the world? Scientists have found the secret behind the whales' amazing songs.
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
Mythical - Not real. Made up in stories or legends.
Baleen whales - Baleen whales have baleen in their mouths, which act like big sieves to filter food from water.