What's the Oldest Creature in Washington?

"Top Line" gets an up-close look at the Smithsonian's 66-million-year-old Tyrannosaurus Rex.
4:26 | 09/05/14

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Transcript for What's the Oldest Creature in Washington?
Hello and welcome -- top line I'm Olivier knocks from Yahoo! News and I'm Rick Klein and ABC news and we are joined today by doctor Matthew Carano who's the curator of dinosaur act at. At the Smithsonian's natural history museum Matt thanks a lot. Welcome we cannot cover an awful lot of fossilized dinosaurs that they don't usually come in a bunch of crates stance T Rex and US Army Corps of Engineers. What are you working on in here. Well we're working on his the Smithsonian's first nearly complete trying to search Rex skeleton comes to us from Montana and it's going on display and 2019. What took so long I -- will be surprised especially if they'd seen T -- is that he's used before to know that the Smithsonian hasn't had passed its cigarettes a little while and we have. Less complete specimens that your -- in the collection but nothing really worth. Showing off -- really only a handful of specimens today now we know of -- 20/20 five specimens but it's taken us a hundred years to get that -- Does this T -- have a name and what. Part of it are we looking at. We haven't really given it a name other than the nation's T Rex. What we're looking at that was part of the skull and just a small part of the skull this is the left side of the animal and this would be. The eye socket. So the animals I would fit neatly into this little circle the snout of the animal would go off -- that correction the back of the head in this direction and all told there would be about four feet long. And these are fragments that are pasted together -- the other someone. Yes to these individual bones didn't. Rock completely and -- fossilized. We're able now to reattach them. At the lines that they originally joined you can see of course -- -- little bits of repair work but direction really complete and well preserved specimens what's missing. In this animal we're actually missing kind of a random assortment of -- so we have almost every -- in the skull but we don't always have both the left and the right side that. And likewise we have some of the -- on one side might be missing but we have them on the other -- actually know what the whole animal looks like -- here and there were missing -- -- to. So what's the process how to these crates that looked like something a raiders lost -- become. The actual T Rex that they'll be on display in a few years -- what's happened. -- now -- visitors can watch us unpack conserve the bones that make sure there really -- condition that they can be put on display. And then they're going to be taken to a facility in Canada where a company is gonna construct a metal arm richer. That are -- is gonna be solid enough and specific enough that each individual -- can be put on it but removed if we need to do any sort of studies or repair work. Once that's done in a couple years. All of that comes back and reconstructed in the exhibit hall what was it like when it was a lot snout to the -- of the -- what -- kind of creature we're talking. Well this particular individual T Rex was -- eighteen or nineteen years old when it died which would have been nearly fully grown but not quite fully grown. We don't know who was a male or female. But it would have been about 4042 feet long maybe sixteen feet tall. Would have had about a four foot long head. Those classic tiny little for arms but it would have did a pretty formidable animal. What can you learn by by analyzing the -- the fossilized bones themselves what kind of knowledge do you draw from looking at analyzing the individual. Pieces simply looking at that shapes the size is all the details you can actually see hear all these little lines represented blood vessels that -- allow. Run along the surface of this -- so we custody the anatomy just incredible detail. We can also take samples from inside the bone. Instead -- microscopically and that's how we learn about how old that is we can try to see whether we -- of male or female. On things about its growth rate and metabolism all that's locked inside the -- where do you come down on the rampaging. Predator hunting it's pray vs. Media more stabbing -- type creature when it comes to -- -- large predators. Don't pass up opportunities for dinner. So they attack animals that they can catch and kill and they eat dead animals when they find them so I don't think this animal this T -- have been any different from the ones we see today. All right doctor thank you very much your timing for this visit. Thank you. That's all the time we have this week for top line for Yahoo! News -- Olivier Knox and for ABC news on Rick -- you watched all week long on news dot Yahoo.com and abcnews.com. And has -- -- on us next time.

This transcript has been automatically generated and may not be 100% accurate.

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