‘Astounding’: Alabama woman with two uteruses is pregnant in both wombs
theguardian.com
Kelsey Hatcher, a 32-year-old mom of three was born with a rare uterine anomaly called uterus didelphys, or two uteruses. However, she was not diagnosed with the condition until last spring, when she discovered she was pregnant – in each uterus.
Hatcher said her husband almost didn’t believe her.
“He said: ‘You’re lying,’ I said: ‘No, I’m not,” Hatcher told NBC News.
Uterus didelphys affects about 0.3% of women. The abnormality forms in the female embryo very early in development, around eight weeks gestation, according to fertility researchers.
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I was going to ask if other animals were capable of multiple simultaneous pregnancies, but then I figured I should probably just google it.
Interestingly I found that it has indeed happened to humans, but it confirms your idea, because in the latest documented example, the children were born at the same time.
https://en.m.wikipedia.org/wiki/Superfetation
All mammals that give birth in litters have one large and “lumpy/compartmentalized” uterus. Opossums (not mammals) for example have a forked reproductive tract which forks in the vaginal canal with two distinct “halves” leading to a different uterine compartment. I don’t think there’s any animal with two completely separate uteruses; please correct me if there is one though 😛
Opossums are mammals, just not placental mammals. Marsupials are in the class of mammals, and kangaroos have two separate uteruses
I mean this post is about one