Do all mammals deliver a placenta after giving birth?

Question

I would assume so, but that part was never shown on any animal birthing videos that I have seen so I'm not totally sure

Answer 1

I think you should work the significance of the term "animal". If you mean by "animal" as mammals then you are mistaken since a few mammal (like the ornithorhyncus) are oviparous, not viviparous. Other animals like reptiles, sharks, etc have evolved different traits in the embryo develompent. (e.g. some sharks have: ovoviviparism, in which the embryo develops inside the mother but there is no connection between them (no placenta)). Excuse my english, hope it helps

Answer 2

Yes all babies need to get nutrients from their mothers through the placenta.

Answer 3

Not all animals have placentas.  Monotremes and Marsupials do not.

Of those that do, yes, they deliver it after birth.

Answer 4

yes, all animals do.  The placenta is and organ used to feed the baby as it grows in it's mother, so it wouldn't be of use.

Answer 5

Since a Platypus is an egg laying mammal I would say that they don't deliver a placenta after laying eggs.  I'm just saying...

Answer 6

No, only Placental Mammals, Infraclass Eutheria

Marsupials and Monotremes, Infraclass Metatheria and  Subclass Prototheria respectively, do not.