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Sand tiger shark

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Sand tiger shark

Post by sujin007 on Wed Dec 05, 2012 10:33 am

Known in Australia as Grey Nurse Sharks, these fierce-looking , if they are usually harmless to humans, predators are #1 in this list of wild baby predators with very good reason.

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Re: Sand tiger shark

Post by sujin007 on Wed Dec 05, 2012 10:35 am

Female Sand Tiger Sharks have two wombs, and each of them produces many eggs. The eggs hatch while still inside the womb..

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Re: Sand tiger shark

Post by sujin007 on Wed Dec 05, 2012 10:37 am

The Sand Tiger embryos soon develop sharp teeth and start killing and eating their brothers and sisters and any unfertilized eggs in the womb, until there is only one embryo left alive in each womb.

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Re: Sand tiger shark

Post by sujin007 on Wed Dec 05, 2012 10:38 am

As a result, the mother only gives birth to two pups , the last survivor of each womb, and since they fed abundantly in the womb, they are already quite big when they are born, around one meter long!

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Re: Sand tiger shark

Post by sujin007 on Wed Dec 05, 2012 10:40 am

The Sand Tiger shark is therefore the only fratricide in this list that starts killing their siblings before being born; at the moment of its birth, it is already an experienced killer.
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Re: Sand tiger shark

Post by sujin007 on Wed Dec 05, 2012 10:41 am


This brutal survival strategy is known as intrauterine cannibalism, and was discovered in 1948 when a scientist, who was probing the womb of a Sand Tiger Shark, was bitten in one hand by one of the embryos!

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Re: Sand tiger shark

Post by sujin007 on Wed Dec 05, 2012 10:43 am

Although intrauterine cannibalism has been reported in other species of sharks, including the Great White Shark and even the Basking Shark , a placid, harmless plankton-eater as an adult..

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Re: Sand tiger shark

Post by sujin007 on Wed Dec 05, 2012 10:45 am

Great White Shark and the Basking Shark feed only on unfertilized eggs while in the womb. The Sand Tiger Shark is the only shark known to cannibalize other embryos in the womb.
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