今注目を集めている Do Sharks Lay Eggs or Give Birthについて、詳しいまとめを分かりやすく掲載しています。

Well, if you ever find a mermaid’s purse on the beach, you now know: that was a shark nursery. You found a baby’s first home.

And if you see a live-born shark pup, you know it either chewed its way out of an egg case, or its mom had a weird internal soup of eggs and cannibalism. No pressure on the pup, right?

What’s really cool is that scientists use this to figure out how different sharks survive. Egg-layers? They rely on safe hiding spots for their eggs. Live-bearers? They invest a ton of energy into a few super-high-quality babies.

It’s a classic strategy trade-off. Quantity vs. quality. Eggs vs. cannibal pizza parties.

Next time you see a shark documentary and someone says “This species gives live birth,” you can nod smugly and say, “But is it viviparous or ovoviviparous?”

Or, you can just sit back and enjoy the fact that sharks are the ultimate weirdos of the ocean. They lay eggs in purses. They eat siblings in the womb. They make pregnancy look like a horror movie.

One more thing: they are not mammals. Sharks are fish. All this reproduction drama, and they’re just glorified swimming nose-balls. Amazing.

So, egg or live birth? Yes. And also a little bit of chaos.

Now go impress your friends at the beach. Or just find a mermaid’s purse and give it a respectful nod. You know the truth now.