Gary Bell/ Oceanwide / Porcupinefish (Diodon nicthemerus) in defensive posture, Port Phillip Bay, Mornington Peninsula, Victoria, Australia

Juergen Freund / Globefish (Diodon nicthemerus) swimming past a mass of plastic moving in the current, North Sulawesi, Indonesia.

Solvin Zankl / Porcupinefish (Diodontidae) tiny juvenile, found in plankton community, Sargasso Sea, Bermuda.

Flip Nicklin / Long-spine Porcupinefish (Diodon holocanthus) in defense posture, North America

Fred Bavendam / Porcupinefish (Diodon nicthemerus) swallows water to puff itself up and points its spines outward as a defense against predators, South Australia

Gary Bell/ Oceanwide / Sea Star (Coscinasterias muricata) feeding on Porcupinefish (Diodon nicthemerus) carcass, Port Phillip Bay, Mornington Peninsula, Victoria, Australia

Gary Bell/ Oceanwide / Porcupinefish (Diodon nicthemerus), Port Phillip Bay, Mornington Peninsula, Victoria, Australia

Graham Eaton / Black-blotched porcupinefish (Diodon liturosus) on reef, Komandoo Island, Maldives, January.

Shane Gross / Burrfish (Chilomycterus schoepfi) swimming above an algae bed at night in a land locked alakaline lagoon on Eleuthera, Bahamas.

Franco Banfi / Diamond stingray (Dasyatis brevis) with Longspined porcupinefish (Diodon holocanthus), Cabo Pulmo Marine National Park, Baja California Sur, Mexico

Juergen Freund / Long-spine Porcupinefish (Diodon holocanthus) in its discarded aluminum can home, North Sulawesi, Indonesia. November.

Juergen Freund / Long-spine Porcupinefish (Diodon holocanthus) in its discarded aluminum can home, North Sulawesi, Indonesia. November.