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.

Pete Oxford / Porcupine fish (Diodon hystrix) Bonaire, Netherlands Antilles, Caribbean

Tim Laman / Bluestreak cleaner wrasse (Labroides dimidiatus) cleaning a Spotted Porcupinefish (Diodon hystrix) on a coral reef in Bali, Indonesia.

Jeff Rotman / Porcupinefish (Diodon hystrix) close-up of spines. Egypt, Red Sea.

GEORGETTE DOUWMA / Black-spotted porcupinefish {Arothron hystrix} Lembeh Strait, North Sulawesi, Indonesia.

GEORGETTE DOUWMA / Black-spotted porcupinefish {Arothron hystrix} Lembeh Strait, North Sulawesi, Indonesia.

Doug Perrine / Diver with inflated Porcupine fish {Diodon hystrix} Florida, USA.

GEORGETTE DOUWMA / Porcupinefish {Diodon hystrix} Andaman sea, Thailand

Jabruson / Porcupine fish {Diodon hystrix} made into tourist curio for sale on Sal Is, Cape Verde Islands

Jeff Rotman / Porcupine fish close-up of spines {Diodon hystrix} Red Sea