American Museum of Natural History

At the American Museum of Natural History in New York City, the skeleton of a Tyrannosaurus rex crouches in a hunting pose -- head low to the ground, tail raised for balance. But just a few years ago, the same skeleton looked more like Godzilla, standing tall and dragging its tail.

The T. rex's new posture is one result of discoveries that have changed the way paleontologists think about all kinds of ancient creatures. The museum's just-opened World-Wide Web site -- where the T. rex can be found in a section called "Fossil Halls" -- reflects some of those new attitudes, and at the same time showcases some of the millions of specimens in the museum's collections.

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