What is a seahorse, anyway?
Seahorses are truly unique.  Unlike their  hoofed namesakes, seahorses have all the necessary parts of a fish:  fins for swimming, gills for breathing, and a swim bladder for keeping them afloat.  Seahorses differ from their fishier relatives by having an upright posture; a long, tube-shaped snout and a prehensile tail for grabbing hold of plants and corals.  Their jaws are sealed together with just a small opening at the end for sucking in food.