The oldest embryo kills and consumes its siblings, causing it to grow exponentially bigger and stronger.
A new film has revealed the disturbing and violent details of how sand tiger sharks begin their lives.features researcher Demian Chapman from Florida International University who has been studying the species for more than six years.
"One big clue was one of the researchers actually stuck his fingers into the womb of a sand tiger that was dead and actually got bitten by one of the embryos," he said. "What happens is the oldest of those embryos is actually a little bit ahead in terms of development of the others—develops teeth and eyes a bit earlier," Chapman said."And once it's got those things it actually starts hunting and killing all of its siblings. So they're cannibals before birth which is really wild."
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