Alex Mustard / Spotted porcupinefish (Diodon hystrix) swimming in open water above a coral reef, West Bay, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Pascal Kobeh / Common porcupinefish (Diodon hystrix) resting at night. Baja California, Mexico.

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 / 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