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Meet 'Big Sam': The massive dinosaur skull found after 72 million years

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The huge prehistoric discovery found after 72 million years

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The giant fossilised head of a dinosaur has been discovered after 72 million years.

Dinosaur experts, known as palaeontologists, found the skull during a dig in Alberta, Canada.

The large plant-eating dinosaur called Pachyrhinosaurus, has also been nicknamed Big Sam.

The animal's skull weighs 600lb (272kg), which is about as heavy as 40 bowling balls and was found in an area called Pipestone Creek.

It is the second adult and biggest skull discovered in the area which is known as a location where several dinosaur bones have been uncovered.