Rare dinosaur "mummies" preserve dinosaur skin.

George Barrowclough, Associate Curator, Division of Vertebrate Zoology

James Carpenter, Peter J. Solomon Family Curator, Division of Invertebrate Zoology

Fossil bones from T. rex and others reveal battle scars.

Trackways provide important clues.

Some of the best evidence comes from T. rex.

Scientists find colored, feathered dinosaur fossils.

Scientists examine the bones of dinosaurs for clues.

An asteroid impact might have played a role.

The challenges scientists face in cloning DNA.