A stock photo shows a small shark in water. Scientists grew two shark embryos in an artificial uterus constantinopris/Getty Images. The embryos were kept inside the uterus for five months. During ...

Preemie sharks that would otherwise die get by with a little help from a human-made womb. This article was originally featured on Hakai Magazine, an online publication about science and society in ...

When Shark Fetuses Attack. Posted: May 21, 2015. As humans, we tend to think of the womb as a nice, warm, safe place. But if you were a sand tiger shark, the womb might seem like the most ...

Female sand tiger sharks have two uteri and carry hundreds of eggs. ... But each time they give birth after a 12-month pregnancy, they produce just two offspring — one from each uterus.

Female sand tiger sharks have two uteri. In each, the biggest embryo will consume its womb-mates until it's the only one left, so the mother will only give birth to two pups.

Scientists have known for years that unborn sand tiger sharks devour their womb-mates until there are just two left. Now, new research has figured out why. Here to tell us more about the ultimate ...

“The reproductive systems of sharks have great diversity, ... pups cannibalize each other in the womb, reducing 40 embryos down to just two by birth.