The Bluebottle or Portuguese Man of War (Physalia physalis) is commonly thought to be a jellyfish but it is actually a siphonophore. The bluebottle has an inflatable sail which keeps it on the surface as it blown by the ocean winds and currents. Its tail is quite poisonous known even to kill. This specimen was found on the beach near Lake Barracoota in the Howe Wilderness Zone of Croajingolong National Park, Victoria, Australia.
To see other images from this area check out my Croajingolong gallery.
$30 a month of photography related profits go to the Wilderness Society