Scientists believe they have been given an extraordinary view of the last day of the dinosaurs after they discovered the fossil of an animal they believe died that day.
An upcoming BBC documentary looks at a slew of fossils found at the Tanis site in North Dakota. It includes the Thescelosaurus leg, seen in a video here, and the skin of a triceratops, pictured above.
The site is rich in well-preserved fossils, including fish, a turtle, and even the embryo of a flying pterosaur encased in an egg.
Scientists believe that tiny glass-like particles of molten rock lodged in the gills of fish fossils found at the site were kicked up by the asteroid's explosive impact, the BBC said.
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