Nick Turner / Men pulling on a rope in a tug of war competition, Cotswold Olimpicks, Chipping Campden, Gloucestershire, June 2011.

Wild Wonders of Europe / Lundgren / Portuguese man-of-war (Physalia physalis) on the water surface, Pico, Azores, Portugal, June 2009

Wild Wonders of Europe / Lundgren / Portuguese man of war (Physalia physalis) Pico, Azores, Portugal, June 2009

Juergen Freund / Portugese man-of-war / Blue Bottle {Physalia physalis} split level showing float and tentacles, Indo-pacific

Claudio Contreras / Portugese Man-Of-War (Physalia physalis) stranded on beach, Boca Chica, Texas, USA February.

Claudio Contreras / Portugese Man-Of-War (Physalia physalis) stranded on beach, Boca Chica, Texas, USA, February.

MYN / Paul Marcellini / Portuguese man of war (Physalia physalis) Florida, USA, December. meetyourneighbours.net project

Nick Turner / Men pulling on a rope in a tug of war competition, Cotswold Olimpicks, Chipping Campden, Gloucestershire, June 2011.

Nick Turner / Men pulling on a rope in a tug of war competition, Cotswold Olimpicks, Chipping Campden, Gloucestershire, June 2011.

Alex Mustard / Portuguese man-of-war (Physalia physalis) washed up on a beach, West Palm Beach, Gulf Stream, West Atlantic Ocean, Florida, USA.

MYN / Paul Marcellini / Portuguese man-of-war (Physalia physalis) Florida, USA, December. meetyourneighbours.net project

Wild Wonders of Europe / Lundgren / Portuguese man of war (Physalia physalis) at surface, Pico, Azores, Portugal, June 2009

Wild Wonders of Europe / Lundgren / Portuguese man of war (Physalia physalis) at surface, Pico, Azores, Portugal, June 2009

Tim Laman / Magnificent frigate birds {Fregata magnificens} nesting rookery on protected mangrove island, Man-of-war Cay, Belize, May 2005

Luis Quinta / Mass of Portuguese man of war {Physalia physalis} Azores, Atlantic ocean

Juergen Freund / Float on water surface of Portugese man-of-war / Blue Bottle {Physalia physalis} Indo-pacific

Juergen Freund / Portugese man-of-war / Blue Bottle {Physalia physalis}, Indo-pacific

Juergen Freund / Portugese man-of-war / Blue Bottle {Physalia physalis} split level showing float and tentacles, Indo-pacific

Juergen Freund / Close up of tentacles of Portugese man-of-war / Blue Bottle {Physalia physalis}, Indo-pacific

Juergen Freund / Close up of tentacles of Portugese man-of-war / Blue Bottle {Physalia physalis} Indo-pacific

Juergen Freund / Portugese man-of-war / Blue Bottle {Physalia physalis} floating on water surface, Indo-pacific

GEORGETTE DOUWMA / Bluebottle / Portuguese man-of-war (Physalia utriculus) showing its inflated float and long trailing tentacles, swept ashore by onshore winds. Cape, South Africa.

Willem Kolvoort / Potugese Man of War (Physalia physalis} stranded on Babunsanti Beach, Galibi, Surinam. 2003.

Hiroya Minakuchi / Portuguese Man of War (Physalia physalis) floating on ocean surface, Portugal

Norbert Wu / Portuguese Man of War (Physalia physalis) a siphonophore colony split into work groups, poisonous, Belize

Norbert Wu / Portuguese Man of War (Physalia physalis) a siphonophore colony split into work groups, poisonous, Belize

GEORGETTE DOUWMA / Violet snail / Bubble raft shell {Janthina janthina} feeding on pelagic jellyfish, Portugese man of war {Physllia utriculus} South Africa

Martin Camm / Carwardine / Illustration of Portuguese Man of War / Man o' War / Blue Bubble / Blue Bottle (Physalia physalis), Physaliidae (Wildlife Art Company).

Nature Production / Portuguese Man-of-war {Physalia physalis} Wakayama, Japan, July