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Peck's Rex or Peckrex Catalog number MOR 980 Common name Peck's Rex or Peckrex Species Tyrannosaurus rex Age 66 million years[1] Date discovered 1997 Discovered by Lou Tremblay[2] Peck's Rex (also known as "Peckrex", "Rigby's rex" and Tyrannosaurus "imperator"[3]) is the nickname (specimen number MOR 980) given to a fossil specimen of the dinosaur species Tyrannosaurus rex, found in Montana in 1997.[4] The excavation was led by J. Keith Rigby, and the fossil got its nickname after Fort Peck, which is located close to the place of discovery. Peck's Rex has been part of several exhibitions on dinosaurs, and is specifically famous because it was the first specimen of its species to have Metacarpal III preserved.[5][6] Contents 1 Description 2 Exhibition and sales 3 References 4 External links. Description The fossil of Peck's Rex is relatively well preserved.[7] The skeleton includes a relatively complete skull with jaws, multiple vertebrae of the back and tail, a well preserved gastralium, and hipbone with complete ischium and pubis. The left hindleg is relatively complete, missing only some toe bones. The forelimbs include the scapula and furcula, both humeri and right hand phalanges, as well as metacarpal III. Because the skeleton is of the gracile morphotype, Peck's Rex is believed to be a male, although the hypothesis which suggests that the sex of Tyrannosaurus specimens can be determined by the degree of skeletal sturdiness has been debated in recent years. Peck's Rex has been the subject of research regarding parasitic infections in dinosaurs.[8] The forelimbs of Peck's Rex have also been studied as they show evidence of use. This evidence includes the construction of metacarpal III, as well as repeated fractures in the furcula - possibly caused by heavy loads or pressure (Carpenter and Lipkin, 2005).[9] Exhibition and sales Casts of Peck's Rex have been featured at several museums including the Maryland Science Center, the Fort Peck Interpretive Center and Museum[10] (beside a lifesized model), and the Carnegie Museum of Natural History as part of the exhibit: Dinosaurs in Their Time where it is mounted in a "face off" position against the holotype Tyrannosaurus skeleton (CM 9380).[11][12][13][14]. Cast pieces and skeletons of Peck's rex (like forelimbs, teeth, and parts of the jaws and feet) are also for sale.[15] References ^ article-niche.com. ^ www.mth.bz. ^ Dinodata.org. ^ article-niche.com. ^ www.greatfallstribune.com/news. ^ Metacarpal III has also been found in "Wyrex" ( see Tyrannosaurus rex, the tyrant king by Peter Larson and Kenneth Carpenter, page 55). ^ However, different sources quote different degrees of completeness. For example, Tyrannosaurus rex, the tyrant king (Carpenter and Larson), side 51, suggest that about 40% of Peck's Rex bones are known, while other sources claim 80% or more (see http://article-niche.com/launch/Digging-For-Dinosaurs.htm). Another source argues it is the second best preserved Tyrannosaurus skeleton (see http://www.ckpreparations.com/currentprojects), and Black Hills Institute says it's complete to about 30% (see their Tyrannosaurus rex specimens list at http://www.bhigr.com/pages/info/rex_chart.htm). ^ [1] ^ dml.cmnh.org. ^ www.visitmt.com. ^ www.pittsburghcitypaper.ws. ^ www.post-gazette.com. ^ Carnegie Museum of Natural History's homepage. ^ Carnegie Museum of Natural History's homepage. ^ Fort Peck's "Giftshop". External links. Peck's Rex at Fort Peck official homepage. Lou Tremblay's photo album of the Peck's Rex discovery. Complete mounted skeleton of Peck's Rex. Skull of Peck's Rex. Peck's Rex at exhibit. Casts of Peck's Rex forelimb to sale.