These are lined seahorses. They are also called northern seahorses. I saw them at SeaWorld‘s Manta Aquarium. Seahorses are fun to watch. They change color to blend in with their surroundings, and they like to hang on to plants with their tails. I think the plants in this picture are Eelgrass. Seahorses eat small crustaceans. They are not strong swimmers, so they hold on to a plant, blend in, and wait for food to come by. They live in the western Atlantic Ocean.
Seahorses give birth in a very special way. With most animals, the babies are born from the female. But with seahorses, the male has a brood pouch that the babies are born from. The male gives birth to hundreds of tiny seahorses at a time.