How does the hippocampus give birth?

There is a bag in the lower part of the front part of the male hippocampus tail, which is called the incubation bag. This bag is made of two layers of folds.

There is a hole in front of the bag, which is the passage for the female hippocampus to put eggs into the bag and the young hippocampus to leave the bag. Every time the female seahorse passes through this hole and puts hundreds of eggs into the bag of the male seahorse, the egg embryo develops into a small seahorse in the bag. Under the protection of the spongy inner and outer layers of the hatching sac of the male hippocampus, the young hippocampus has matured after a certain period of time. At this time, the little hippocampus was tossed away in his father's "cradle". The male seahorse foresaw that he was going to give birth, so he bent his tail and leaned forward, and the sac opened automatically. With muscle contraction, the small hippocampus was squeezed out of the capsule one by one. Since then, these little seahorses have lived an independent and free life.