A dinosaur's leg, stunningly preserved, has been presented by scientists claiming it was likely killed by a giant asteroid which caused the species' extinction.

The limb, complete with skin, is just one of a series of remarkable finds emerging from the Tanis fossil site in the US State of North Dakota.

But it's not just their exquisite condition that's turning heads - it's what these ancient specimens purport to represent.

The claim is the Tanis creatures were killed on the actual day the asteroid struck Earth 66 million years ago, which saw the reign of dinosaurs end.

The BBC's Rebecca Morrelle reports.

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