>>661137They are mammals
There are three kinds of mammals, most are placental mammals like humans, the fetus completely forms inside the mothers body and is born ready to live in the world. Marsupials only spend part of there fetal stage in the womb, they are born "prematurely" and spend the rest of their developmental period in their mothers pouch drinking milk technical theys been born but if removed from there pouch they will die. A platypus is a monotreme and lays eggs. What ties these three categories as mammals is the fact that they all have mammery glands that produce the milk they use to nurture there young.
> I know my explanation is kind of shitty and I'm hoping that at the very least I infuriate somebody enough to come and do a better job> picture is a baby kangaroo in tge early stages of being in is mothers pouch 