Sand tiger shark trivia: It eats its siblings in the womb while it’s still an embryo

Sand tiger sharks usually give birth to only two babies, but they can carry up to 12 embryos…

Sand tiger shark trivia: It eats its siblings in the womb while it's still an embryo
Sand tiger shark trivia: It eats its siblings in the womb while it’s still an embryo

Sand tiger sharks usually give birth to only two babies, but they can carry up to 12 embryos in the womb. About five months into a typical 12-month pregnancy, the largest embryos start to devour all but one of their cohorts, but scientists have been unable to figure out why.


It turns out that this bloody in-utero massacre was the mother’s fault, all because of the consequences of mating with multiple males.

In 2013, a team of Marine biologists led by demian chapman of stony brook university in the United States began their research. They decided to analyze the embryos of 15 sand tiger shark mothers at different stages of development. DNA tests have shown that in the latter stages of pregnancy, the few embryos that are more likely to remain appear to have only one father. This means that embryos from the strongest fathers are competing with other embryos and winning.

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137comments

  1. Why is the shark alone? Is n’t it eaten by humans? It ’s a self-righteous editor, and it ’s forced into a fantasy plot. I ’m lonely.

  2. Your ignorance is not your fault, but it ’s your fault if you come out to scare people

  3. The scars left by yourself to challenge others are proof of the strong. The probability of being hit by a knife in life for no reason is too small (ignored by the group), but when it is suffered, it is the disaster of extinction.

  4. It is worthy of being a creature that has existed on the earth for 500 million years, and is a killer in the womb.