Hippocampus were the fish-tailed horses of the sea. They were depicted as composite creatures with the head and fore-parts of a horse and the serpentine-tail of a fish. In mosaic art they were often had green scales and fish-fin manes and appendages.
The ancients believed they were the adult-form of the small fish we call the "sea-horse". Hippocampus were the mounts of Nereidnymphs and sea-gods, and Poseidon drove a chariot drawn by two or four of the creatures.
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Mythical Creatures
FantasyThis is the book of all of mythical creatures. Hope this useful for writing your fantasy story.