NotAnotherScientist t1_jdmyu32 wrote on March 25, 2023 at 4:33 PM

Reply to comment by _Dnikeb in TIL, the placenta that forms with a fetus isn't created by the mother. It grows from the fertilized egg and some fetuses actually develop outside the uterus attached to the intestines in the body cavity. by darw1nf1sh

Really cool information. Thanks for sharing!

For those curious, I looked up non-placental mammals and as I was expecting, it's marsupials and the duck-billed platypus among others. What surprised me to learn is that the anteater is also a non-placental, non-marsupial mammal. Now I want to read more on the anteater.