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

Tony Wu / Porcupine pufferfish (Diodon holocanthus) three males pursuing a female, Lembeh Strait, North Sulawesi, Indonesia

Sue Daly / Long-spined porcupinefish (Diodon holocanthus) on wreck of the Rainbow Warrior, Cavalli Islands, New Zealand, February

MYN / Paul Marcellini / Longspined burrfish / Balloon fish (Diodon holocanthus) Florida, USA, November. meetyourneighbours.net project

MYN / Paul Marcellini / Longspined burrfish / Balloon fish (Diodon holocanthus) Florida, USA, November. meetyourneighbours.net project

Michele Westmorland / Balloon fish (Diodon holocanthus) on seabed, St Vincent, West-Indies, Caribbean, May.

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

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

Pete Oxford / Freckled Porcupinefish / Balloon fish (Diodon holocanthus) off of North Stradbroke Island. Queensland. Australia

Pete Oxford / Balloonfish (Diodon holocanthus) Tagus Cove, Isabela Island. Galapagos Islands, Ecuador, South America

Pete Oxford / Balloon fish (Diodon holocanthus) Tagus Cove, Isabela Island, Galapagos Islands, Ecuador, South America

GEORGETTE DOUWMA / Balloon fish (Diodon holocanthus) amongst corals, Lembeh Strait, North Sulawesi, Indonesia