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RE: Shark eating dino fossil found in Utah

A sawfish vertebra was found lodged in the jaw of _Spinosaurus_, further
evidence for spinosaurid piscivory.  See
http://www.newscientist.com/article.ns?id=mg18925384.600 and:

dal Sasso, C., S. Maganuco, E. Buffetaut and M. A. Mendez (2006). "New
information on the skull of the enigmatic theropod Spinosaurus, with remarks
on its sizes and affinities." Journal of Vertebrate Paleontology, 25(4):
888-896 .

As for other theropod dinosaurs, _Yanornis_ and _Confuciusornis_ have been
found with fish remains in their guts. 

Dino Guy Ralph
Docent at the California Academy of Sciences
Dinosaur and Fossil Education
Member of the Society of Vertebrate Paleontology