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

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