Seahorses

While Seahorses exhibit somewhat unusual romantic behaviour, it's though that most of the species mate for life. They'll demonstrate their interest in a relationship by holding tails, swimming snout to snout, and changing colours. The guy is actually the one to carry babies, after the lady has laid her eggs in his pouch which resembles that of a kangaroo. When ready to enter the world, babies will hatch straight into the water, and not long after the male has given birth, his partner will once again deposit eggs. The sight of seahorses in a flirtatious courtship dance is a truly fascinating one, with muscular tail used to grasp the partner during the affectionate embrace.