A giant seahorse is about 8 feet long from the top of its head to the tip of its tail. Its body is covered with fine scales and its head is horse-like with a long snout. Its back is lined with small dorsal fins. (These aid it in swimming.) Near the base of its head are pectoral fins that help the giant seahorse turn while swimming. A giant seahorse ranges in color from yellow to dull green or brown. Its eyes are almost always brown with the occasional giant seahorse having blue eyes.