and also how do we know it's a male? because for accouchement you need a vagina right?
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The male seahorse is equipped with a brood pouch on the ventral, or front-facing, side. When mating, the female seahorse deposits up to 1,500 eggs in the male's pouch. The male carries the eggs for anywhere from 9 to 45 days until they emerge, expelling fully developed, miniature seahorses in the water. Once the seahorse babies are released into the water, the male's role is done and he offers no further care.