Image: Prof. Paul Sereno holds a plaque cast of two juvenile skeletons of the ostrich-mimic dinosaur sinornithomimus
Mike Hettwer  /  Project Exploration via AP
Prof. Paul Sereno holds a plaque cast of two juvenile skeletons of the ostrich-mimic dinosaur sinornithomimus. In their rib cages are stomach stones and the carbonized remains of the last plants they consumed. The dinosaurs died when they were a little over one year in age.
updated 3/16/2009 1:42:01 PM ET 2009-03-16T17:42:01

Apparently, reckless adolescent behavior has been around a lot longer a lot longer than people realize. As a matter of fact, it's been around a lot longer than people.

University of Chicago paleontologist Paul Sereno says that's one of the lessons of some recent fossil finds in the desert regions of China.

Sereno says a large group of adolescent and preadolescent dinosaurs died en masse 90 million years ago when they ran into a mudhole, sinking to their doom.

Many of the 25 individuals recovered were so perfectly preserved that their last meals could be identified.

Sereno is scheduled to give a formal report Monday in the provincial capital of Inner Mongolia on the findings of the joint U.S.-Chinese expedition that found the fossils.

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