David Fleetham / Guineafowl pufferfish (Arothron meleagris) puffed up in defence, Hawaii.

Alex Mustard / Colourful reef scene with Coral grouper (Cephalopholis miniata), map puffer (Arothron mappa) and Panda butterflyfish (Chaetodon adiergastos). Tank Reef, Fiabacet Islands, Misool, Raja Ampat, Indonesia...

Georgette Douwma / Guineafowl puffer fish (Arothron meleagris) also known as the Golden puffer or Spotted puffer because is has three colour phases which differ dramatically. Maldives, Indian Ocean

Juergen Freund / Giant / Map pufferfish (Arothron mappa) swimming in the reef. Misool, Raja Ampat, West Papua, Indonesia, January

Juergen Freund / Close up of face of inflated pufferfish {Arothron sp}, Indo-Pacific

Juergen Freund / Pufferfish (Arothron) inflated Indo-Pacific

Fred Bavendam / Guineafowl Pufferfish (Arothron meleagris) in its golden color phase puffed up off of Tower Island, Galapagos Islands, Ecuador

Georgette Douwma / Map pufferfish {Arothron mappa} feeding Andaman sea, Thailand

Georgette Douwma / Map pufferfish {Arothron mappa} feeding Andaman sea, Thailand

Georgette Douwma / Black spotted pufferfish {Arothron nigropunctatus} Andaman sea, Thailand

Jeff Rotman / Guineafowl pufferfish inflated at night {Arothron meleagris} Galapagos, Pacific

Pascal Kobeh / Giant pufferfish (Arothron stellatus) and Bigeye snapper (Lutjanus lutjanus) school amongst wreck of Mitsio. Nosy Be, Madagascar.