Triceratops horridus 65 million years old Many will remember this beaked,
big-horned dinosaur with the huge frill from the movie Jurassic Park, in which the visiting scientists tend to a sick Triceratops. After dissolving away fossil bone in their real
specimen, Schweitzer and her colleagues found branched and tapering blood
vessels that remained springy 65 million years after the animal died. Here, two
likely red blood cells are seen within a possible blood vessel running through
fibrous bone matrix.