Diodon holocanthus, commonly known as the spiny pufferfish, is a species of pufferfish found in tropical and subtropical waters. It is characterized by its distinctive spines that protrude from its body when threatened, providing a defense against predators. This fish can inflate its body by swallowing water or air, making it difficult for predators to consume. The spiny pufferfish primarily feeds on hard-shelled invertebrates, such as crustaceans and mollusks. It is known for its unique ability to produce toxins, specifically tetrodotoxin, which can be harmful to humans and other animals if ingested. This adaptation helps deter potential threats in its natural habitat.