Seahorses are small fish that range in size from 1.5 to 35.5 cm. They have a unique equine appearance and swim poorly using their dorsal and pectoral fins. Male seahorses have a pouch to carry eggs until the young are fully developed. Seahorses live in shallow tropical and temperate waters around the world and feed on small crustaceans and larvae. Some seahorse species are endangered due to habitat loss and being used for souvenirs.