The hippocampus is divided into male and female.

Hippocampus is not hermaphrodite. Hippocampus is hatched by male hippocampus. Hippocampus cubs are born by females, put into male hippocampus' pouch, hatch in male hippocampus' pouch for about one month, and then climb out of male hippocampus' pouch. This is also the reason why many people mistakenly think that hippocampus belongs to female hermaphrodite.

The male hippocampus has an abdominal sac (commonly known as a pouch). Mother seahorse releases the eggs in the pouch of father seahorse's abdomen. After 5-6 days, the baby seahorse will hatch from father seahorse's pouch. Father's pouch only plays the role of hatching, and the eggs still come from mother.

Extended information:

In the animal kingdom, it seems a matter of course for females to get pregnant and give birth, but this natural law cannot be applied to the hippocampus. Because in this special population of hippocampus, pregnancy and childbirth are all things that male hippocampus needs to do.

Every breeding season, the male seahorse will actively show his love to the female seahorse in a very special way, spinning in the water like a ballet dancer. At the same time, the color of the male hippocampus will also change. As long as the female seahorses agree to this "marriage", they will begin to mate and give birth to their next generation.

However, the mating process is that the female seahorse lays her eggs in the "pouch" of the male seahorse, where she is fertilized. Father seahorse is the "loving father" in the animal kingdom. They will use the placenta fluid in the "nursing bag" to raise embryos, which will not only provide enough oxygen and nutrition for new life, but also remove the excrement of the little ones.

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Baidu Encyclopedia-hippocampus