Measuring 40ft (12m) in length and weighing upwards of 14 tons, Tyrannosaurus rex was one of the largest and most powerful terrestrial predators in history. The most advanced in an 80 million year chain of tyrannosaurid evolution, T. rex had heavy, deep skulls reinforced with sutures, lightened by hollow chambers... and of course, big, sharp teeth!

This specimen is a fragment of Tyrannosaurus rex bone, recovered on private land in South Dakota from the Hell Creek Formation.

Armored with twin rows of bony-cored plates and sharp tail spikes, Stegosaurus is one of the best-known of all dinosaurs.

The plates and spikes of Stegosaurus are called osteoderms, bony deposits that form in the skin rather than growing as extensions of the skeleton. Lacking an anchor to the skeleton, some scientists believe that Stegosaurus's plates would provide limited mechanical protection. The current scientific thinking leans towards temperature regulation as the primary function.

This specimen is a fragment of Stegosaurus plate, recovered from the Skull Creek Quarry in Colorado. This private quarry is part of the Morrison Formation. Specimens from this location date to the late Jurassic Period roughly 150,000,000 years ago.

Everybody poops—even dinosaurs...

Scientifically known as "coprolites," but commonly referred to as Dinosaur Dung, this is a fossilized dropping from a long necked sauropod found in Morrison Formation.

This specimen is a fragment of agatized coprolite from the Morrison Formation in Utah. It is attributed to a 150,000,000-year-old sauropod, a long necked herbivorous dinosaur. A small information card is also enclosed, which also serves as the certificate of authenticity.