Diodon holocanthus, also known as the long-spine porcupinefish, is a species of fish that is commonly found in the Atlantic Ocean and the Caribbean Sea. This unique fish is known for its long retractable spines, which it uses as a protective mechanism when threatened. Some synonyms that are commonly used to refer to the diodon holocanthus include the porcupine puffer, spiny puffer, balloonfish, and globefish. Despite its prickly exterior, the diodon holocanthus is a popular aquarium fish due to its quirky personality and interesting appearance. This fascinating fish is truly a sight to behold.