Blue Sea Slug Nudibranch Eats Portuguese Man-of-war

The Blue Sea Slug (Glaucus atlanticus) is a nudibranch mollusc that floats upside down at the ocean surface. It drifts around until it encounters something to eat. The Portuguese Man o’ War (Physalia physalis), often known as the ‘bluebottle’ in Australia, also floats at the ocean surface and is the usual food of Glaucus atlanticus. …