The term "Horse of the Sea" commonly refers to the seahorse, a small marine fish known for its unique appearance. Seahorses have elongated bodies, a curled tail, and a horse-like head, which gives them their nickname. They are found in shallow coastal waters and are often associated with coral reefs and seagrass beds. Seahorses are notable for their reproductive behavior, where the male carries and nurtures the young in a special pouch. They are also known for their ability to change color for camouflage. Unfortunately, many species of seahorses face threats from habitat loss and overfishing, leading to conservation efforts.