RICHARD T. NOWITZ / SCIENCE PHOTO LIBRARY RICHARD T. NOWITZ / SCIENCE PHOTO LIBRARY
Mosasaur. Fossilised skeleton of a mosasaur. This large reptile was a marine carnivore which inhabited seas throughout the world between 145 and 65 million years ago. This specimen is over eight metres in length. It is at the University of Kansas Museum of Natural History in Lawrence, Kansas, USA.
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