Sharks are supposed to be the apex predators of the ocean, so how could a 2.2-metre-long pregnant shark seemingly get killed and eaten off the coast of Bermuda?
That is the question a team of US scientists was faced with when the porbeagle shark's tracking device suddenly popped to the ocean's surface off the coast of Bermuda 158 days after it was put on.
Former Arizona State University graduate Dr Brooke Anderson and her research team had been tracking a group of porbeagle sharks - an endangered species - off Cape Cod in Massachusetts between 2020 and 2022.
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