Almost two out of three corals across popular tourism spots at the world heritage-listed Ningaloo reef have died after an unprecedented marine heatwave hit the Western Australia region, scientists have discovered. The areas in Ningaloo's northern lagoon have undergone a 'profound ecological simplification' with coral species that were keystones to the habitat among those killed

• 'Deathly silent': two out of three corals in world heritage-listed Ningaloo reef have been killed, scientists confirm