Claudio Contreras / Balloon fish (Diodon holocanthus) with defensive spines, Puerto Morelos National Park, Caribbean Sea, Mexico, January

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

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.

David Fleetham / Longspined / Freckled porcupinefish (Diodon holocanthus), two. Philippines.

Claudio Contreras / Ghost Crab (Ocypode sp.) eating Balloonfish (Diodon holocanthus) carcass, Playa Morro Ayuta, Oaxaca state, southern Mexico, August

Claudio Contreras / Balloonfish (Diodon holocanthus), San Agustin Bay, Huatulco Bays National Park, southern Mexico, November

Claudio Contreras / Balloonfish (Diodon holocanthus), San Agustin Bay, Huatulco Bays National Park, southern Mexico, November

Franco Banfi / Long-spine porcupinefish (Diodon holocanthus) Salvatierra wreck dive site, Sea of Cortez, Baja California, Mexico, East Pacific Ocean

Tony Wu / Porcupine pufferfish (Diodon holocanthus) three males pursuing a female, Lembeh Strait, North Sulawesi, Indonesia

Tony Wu / Long-spine porcupinefish (Diodon holocanthus) male pursuing a female fish, Lembeh Strait, North Sulawesi, Indonesia

Tony Wu / Long-spine porcupinefish (Diodon holocanthus) male pursuing a female fish to mate, Lembeh Strait, North Sulawesi, Indonesia

Pascal Kobeh / Porcupinefish (Diodon holocanthus) close up skin detail, Sulu Sea, Philippines

Georgette Douwma / Freckled / Spiny porcupinefish (Diodon holocanthus) Lembeh, Sulawesi, Indonesia.

Georgette Douwma / Freckled or Spiny porcupinefish (Diodon holocanthus) with Funnel weed (Padina gymnospora) Lembeh, Sulawesi, Indonesia.

Pascal Kobeh / Close-up of Shortspine porcupinefish (Diodon holocanthus), coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Pascal Kobeh / Longspined porcupinefish / balloonfish (Diodon holocanthus) on reef, San Salvador Island / Colombus Island, Bahamas. Caribbean.

Pascal Kobeh / Longspined porcupinefish / balloonfish (Diodon holocanthus) Baja California peninsula, Mexico. Sea of Cortez.

Jeff Rotman / Short spined porcupine fish (Diodon holacanthus) in Lembeh Strait, Celebes Sea, Sulawesi, Indonesia.

Claudio Contreras / Balloonfish (Diodon holocanthus), Cabo Pulmo National Park, Sea of Cortez (Gulf of California), Mexico, July

Sue Daly / Long-spined porcupinefish (Diodon holocanthus) on wreck of the Rainbow Warrior, Cavalli Islands, New Zealand, February

MYN / Paul Marcellini / Longspined burrfish / Balloon fish (Diodon holocanthus) Florida, USA, November. meetyourneighbours.net project

MYN / Paul Marcellini / Longspined burrfish / Balloon fish (Diodon holocanthus) Florida, USA, November. meetyourneighbours.net project

Michele Westmorland / Balloon fish (Diodon holocanthus) on seabed, St Vincent, West-Indies, Caribbean, May.

Pete Oxford / Balloonfish (Diodon holocanthus) beside fan coral, Coral Reef Island, Belize Barrier Reef, Belize

Pete Oxford / Long-spine Porcupinefish (Diodon holocanthus) in Stove Pipe Sponge (Aplysina archeri), Bonaire, Netherlands Antilles, Caribbean

Michele Westmorland / Balloonfish (Diodon holocanthus) on the seabed, within in coral reef system, Dominica, West Indies, Caribbean.

Pete Oxford / Freckled Porcupinefish / Balloon fish (Diodon holocanthus) off of North Stradbroke Island. Queensland. Australia

Pete Oxford / Balloonfish (Diodon holocanthus) Tagus Cove, Isabela Island. Galapagos Islands, Ecuador, South America

Pete Oxford / Balloon fish (Diodon holocanthus) Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

Pete Oxford / Long-spine Porcupinefish (Diodon holocanthus) uninflated on ocean floor, Isabella Island, Galapagos Islands, Ecuador

GEORGETTE DOUWMA / Balloon fish (Diodon holocanthus) amongst corals, Lembeh Strait, North Sulawesi, Indonesia

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

Juergen Freund / Balloon fish / Spiny pufferfish {Diodon holocanthus} defense display, Caribbean

Franco Banfi / Long-spine porcupinefish (Diodon holocanthus) swimming over seabed, Espiritu Santo Island, Baja California, Mexico, Sea of Cortez.

Lucas Bustamante / Long-spine porcupinefish (Diodon holocanthus) peering out of hole in reef, Isabela Island, Galapagos National Park, Pacific Ocean.

Claudio Contreras / Long-spine porcupinefish (Diodon holocanthus) swimming through coral reef. Huatulco Bays National Park, Oaxaca state, Mexico, Pacific Ocean. November.

Pascal Kobeh / Longspined porcupinefish (Diodon holocanthus) in front of a school of Yellow / Amarillo snappers (Lutjanus argentiventris) and a Pacific dog snapper (Lutjanus novemfasciatus), swimming over seabed, Se...

Georgette Douwma / RF - Tropical reef fish, composite image on black background, Radial filefish (Acreichthys radiatus), Devilfish (Inimicus didactylus), Black-spotted porcupinefish (Arothron hystrix), Puffer filefish...

Noemie Stroh / Diamond stingray (Dasyatis brevis) foraging on seabed, surrounded by porcupinefish and pufferfish, Cabo Pulmo National Park, Baja California, Mexico, December.

Noemie Stroh / Diamond stingray (Dasyatis brevis) foraging on seabed, surrounded by porcupinefish and pufferfish, Cabo Pulmo National Park, Baja California, Mexico, December.

Noemie Stroh / Diamond stingray (Dasyatis brevis) foraging on seabed, surrounded by porcupinefish and pufferfish, Cabo Pulmo National Park, Baja California, Mexico, December.

David Fleetham / Long-spined porcupinefish (Diodon holocanthus) among corals, Hawaii..

Claudio Contreras / Long-spine porcupinefish (Diodon holocanthus), Xkalac Reefs National Park, Caribbean region, Mexico, May