Under cloudy skies and the threat of rain, conservators at the Smithsonian's National Museum of Natural History unloaded the Nation's Tyrannosaurus rex. Sixteen crates holding this 66-million-year old addition to the institution's exhibits rolled into the museum early on Tuesday morning.

The conservators will check to make sure that this 7-ton (6.4-tonne) animal arrived in the same condition in which it left Montana last Friday, April 11.

The bones will be laid out in the "Rex room" for public viewing starting at 10 a.m. today while museum staff carry out an inventory of the bones. Four other skulls from animals in the Tyrannosaur family will also be on display in the same room.

The arrival of Washington, D.C.'s newest celebrity capped off