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Dinosaur fossil: The femur of Centrosaurus apertus, a ceratopsian dinosaur, and (inset) the foramen.
Photo by Dr Donald Henderson, Curator of Dinosaurs, Royal Tyrrell Museum, Alberta, Canada.

Dinosaur fossil: The femur of <i>Centrosaurus apertus</i>, a ceratopsian dinosaur, and (inset) the foramen. Photo by Dr Donald Henderson, Curator of Dinosaurs, Royal Tyrrell Museum, Alberta, Canada.


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