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.

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

David Fleetham / Giant porcupinefish (Diodon hystrix) at night. Kauai, Hawaii.

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

Richard Robinson / Spot-fin porcupinefish (Diodon hystrix) at North Minerva Reef / Teleki Tokelau a disputed territory in the South Pacific between Tonga and Fiji.

Linda Pitkin / Porcupinefish (Diodon hystrix) on coral reef Klein Bonaire, Bonaire, Leeward Antilles, Caribbean.

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