Seahorses have always been fascinating creatures, and the seahorse habitat is also very interesting. A seahorse is actually a boney fish, and there are about 33 different species of seahorses in the world.These fish will swim upright, like a horse and actually resemble a horse a little. They like to live in the shallows near algae, but the more colorful the seahorse habitat, the more colorful the seahorse is as well. Seahorses will also change color when they are ready to mate. Unlike most animals, the male is the one that carries the eggs, after the female has transferred the eggs to him during mating. After a few weeks of gestation the male seahorse will give birth to live young. Although a gestation period of about three weeks is average, it is not the case with all seahorse species.