Sea urchin
Sea urchins or urchins () are typically spiny, globular animals, echinoderms in the class Echinoidea. About 950 species live on the seabed, inhabiting all oceans and depth zones from the intertidal to . Their tests (hard shells) are round and spiny, typically from across. Sea urchins move slowly, crawling with their tube feet, and sometimes pushing themselves with their spines. They feed primarily on algae but also eat slow-moving or sessile animals. Their predators include sea otters, starfish, wolf eels, and triggerfish.
Marine National Park, Gulf of Kutch
The fauna found here include:
70 species of sponges are found.
Coral 52 species including 44 
species of hard coral and 10 species of soft coral.
Jellyfish, Portuguese man of war and sea anemones are other coelentrates found here.
Arthropods include 27 species of prawns, 30 species of crabs, lobsters, shrimps and other crustaceans.
Molluscs like pearl oysters and sea slugs are present. Octopus which change colour are also found.
Echinoderms like starfish, sea cucumbers and sea urchins are present.
The fishes found are puffer fishes, sea horse, sting ray, mudskippers and whale sharks which are an endangered species.
Endangered sea turtles such as green sea turtles, olive ridleys and leatherbacks are seen here. There are three species of sea snakes.
There are dugongs and smaller cetaceans like finless porpoises, common dolphins, bottlenose dolphins and Indo-Pacific humpback dolphins. Larger whales such as blue whales, sei whales are seen. Humpback whales, and sperm whales may have been almost wiped out due to illegal whaling by the Soviet Union and Japan. Whale sharks can be found in deeper areas. A surprisingly large scale greater flamingo colony, reaching up to 20,000 nests is known to occur along the gulf. There are 42 islands in the Arabian Sea with coral reefs and the park is situated in one of those.