Graham Eaton / Black-blotched porcupinefish (Diodon liturosus) on reef, Komandoo Island, Maldives, January.

Pascal Kobeh / Masked porcupinefish (Diodon liturosus) at night. Maldives, Indian Ocean.

Pascal Kobeh / Masked porcupinefish (Diodon liturosus) at night, Maldives, Indian Ocean.

Pascal Kobeh / Masked porcupinefish (Diodon liturosus) detail of pectoral fin, coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Pascal Kobeh / Masked porcupinefish (Diodon liturosus) and a Threespot dascyllus / damselfish (Dascyllus trimaculatus), Daymaniyat islands, Oman. Gulf of Oman.

David Fleetham / Black-blotched porcupinefish (Diodon liturosus) face close up, Bali, Indonesia, Indo-Pacific.

David Fleetham / Bluestreak cleaner wrasse (Labroides dimidiatus) juvenile and adult inspecting a Black-blotched porcupinefish (Diodon liturosus) foraging on coral, off the island of Yap, Micronesia.

Magnus Lundgren / Wild Wonders of China / Black-blotched porcupinefish (Diodon liturosus) juvenile photographed at night, Green Island, Taiwan. Lundgren