Yeah, lots of living things of different kinds and species do things that humans and other mammals can't do.

Seahorses are fish. So are clown fish. They are completely different to mammals, including humans. They live underwater and can't survive out of water. Which is the opposite of us humans and all the other land-dwelling animals who can't survive under water.

What sea horses do, and the way they reproduce, has no relevance to what humans are, can do, the way we reproduce, and how human sex is defined.

Bees live in colonies where a single female queen bee rules; all the rest of the colony are worker bees, whose sex I previously misstated as males. But slushpilot below has corrected me. It's the drone bees who are male, not the worker bees. Which of course makes sense: the job of the male drone bees is to fertilize the eggs laid by the queen bee, whilst the mostly female bees do all the rest of the work of the hive! Same as it ever was. But either way, how bees behave and procreate, and how bee hives function isn't germane to how humans behave and procreate, and how human societies function.

Kangaroos are mammals. Female kangas have two uteruses, and one external pouch, for gestating/growing their young - which are called joeys. Kangas gestate their joeys in their uteruses for only a short period, then the joeys are birthed and they make their way on their own steam to their mothers' external pouches, where they stay for a much longer time, getting their nutrition from milk from their mothers' teats.

But even though kangaroos are land-dwelling mammals like us humans, they are very different to us and many other mammals in numerous ways. Just look at 'em hop. And at their limbs. What kangas do is not germane to discussions of human sex and behavior, and to human reproduction. Just as what seahorses do has no relevance, either.