Tony Wu / Long-spine porcupinefish (Diodon holocanthus) male pursuing a female fish to mate, Lembeh Strait, North Sulawesi, Indonesia

Pascal Kobeh / Porcupinefish (Diodon holocanthus) close up skin detail, Sulu Sea, Philippines

Georgette Douwma / Freckled / Spiny porcupinefish (Diodon holocanthus) Lembeh, Sulawesi, Indonesia.

Georgette Douwma / Freckled or Spiny porcupinefish (Diodon holocanthus) with Funnel weed (Padina gymnospora) Lembeh, Sulawesi, Indonesia.

Pascal Kobeh / Close-up of Shortspine porcupinefish (Diodon holocanthus), coast of Dhofar and Hallaniyat islands, Oman. Arabian Sea.

Pascal Kobeh / Longspined porcupinefish / balloonfish (Diodon holocanthus) on reef, San Salvador Island / Colombus Island, Bahamas. Caribbean.

Pascal Kobeh / Longspined porcupinefish / balloonfish (Diodon holocanthus) Baja California peninsula, Mexico. Sea of Cortez.

Jeff Rotman / Short spined porcupine fish (Diodon holacanthus) in Lembeh Strait, Celebes Sea, Sulawesi, Indonesia.

Claudio Contreras / Balloonfish (Diodon holocanthus), Cabo Pulmo National Park, Sea of Cortez (Gulf of California), Mexico, July

Pete Oxford / Balloonfish (Diodon holocanthus) beside fan coral, Coral Reef Island, Belize Barrier Reef, Belize

Pete Oxford / Long-spine Porcupinefish (Diodon holocanthus) in Stove Pipe Sponge (Aplysina archeri), Bonaire, Netherlands Antilles, Caribbean

Michele Westmorland / Balloonfish (Diodon holocanthus) on the seabed, within in coral reef system, Dominica, West Indies, Caribbean.