The jellyfish are purple or blue in colour, hence the name Mauve, and were spotted on a 30-mile stretch of coastline between Falmouth and St Austell. Rachael Edmans, the beachgoer in Falmouth who ...

Anyone unfamiliar with the biology of the venomous Portuguese man-of-war would likely mistake it for a jellyfish ... also known as bluebottles for the purple-blue color of their pneumatophores.