 new species, G. sternbergi. Today's paleontologists regard this specimen as a juvenile G. libratus. Dozens of other specimens have been excavated from the Dinosaur Park Formation and are housed in museums across the United States and Canada. G. libratus is the best-represented tyrannosaurid in the fossil record, known from a virtually complete growth series.

In 1856, Joseph Leidy described two tyrannosaurid premaxillary teeth from Montana. Although there was no indication of what the animal looked like, the teeth were large and robust, and Leidy gave them the name Deinodon. Matthew and Brown commented in 1922 that these teeth were indistinguishable from those of Gorgosaurus, but in the absence of skeletal remains of Deinodon, opted not to unequivocally synonymize the two genera, provisionally naming a?Deinodon libratus. Although Deinodon teeth are very similar to those of Gorgosaurus, tyrannosaurid teeth are extremely uniform, so it cannot be said for certain which animal they belonged to. Deinodon is usually regarded as a nomen dubium today. Additional likely synonyms of G. libratus and/or D. horridus include Laelaps falculus, Laelaps hazenianus, Laelaps incrassatus, and Dryptosaurus kenabekides.

Several tyrannosaurid skeletons from the Two Medicine Formation and Judith River Formation of Montana probably belong to Gorgosaurus, although it remains uncertain whether they belong to G. libratus or a new species. One specimen from Montana (TCMI 2001.89.1), housed in the Children's Museum of Indianapolis, shows evidence of severe pathologies, including healed leg, rib, and vertebral fractures, osteomyelitis (infection) at the tip of the lower jaw resulting in permanent tooth loss, and possibly a brain tumor.

Misassigned species 
Several species were incorrectly assigned to Gorgosaurus in the 20th century. A complete skull of a small tyrannosaurid (CMNH 7541), found in the younger, late Maastrichtian-age Hell Creek Formation of Montana, was named Gorgosaurus lancensis by Charles Whitney Gilmore in 1946. This specimen was renamed Nanotyrannus by Bob Bakker and colleagues in 1988. Currently, many paleontologists regard Nanotyrannus as a juvenile Tyrannosaurus
new species, G. sternbergi. Today's paleontologists regard this specimen as a adolescent G. libratus. tons of other specimens have been excavate from the Dinosaur Park Formation and are house in museums across the United States and Canada. G. libratus is the best - represent tyrannosaurid in the dodo record, known from a virtually complete growth serial. 

 In 1856, Joseph Leidy described two tyrannosaurid premaxillary teeth from Montana. Although there was no indication of what the animal look like, the teeth were large and robust, and Leidy gave them the name Deinodon. Matthew and Brown commented in 1922 that these dentition were indistinguishable from those of Gorgosaurus, but in the absence of skeletal remains of Deinodon, choose not to unequivocally synonymize the two genera, provisionally list a?Deinodon libratus. Although Deinodon tooth are very similar to those of Gorgosaurus, tyrannosaurid tooth are extremely uniform, so it cannot be said for sealed which animal they belonged to. Deinodon is usually regarded as a nomen dubium today. Additional likely synonyms of G. libratus and/or D. horridus admit Laelaps falculus, Laelaps hazenianus, Laelaps incrassatus, and Dryptosaurus kenabekides. 

 respective tyrannosaurid skeleton from the Two Medicine Formation and Judith River Formation of Montana probably belong to Gorgosaurus, although it remains uncertain whether they belong to G. libratus or a new species. One specimen from Montana (TCMI 2001.89.1), housed in the Children's Museum of Indianapolis, read evidence of severe pathologies, admit bring around leg, rib, and vertebral fractures, osteomyelitis (infection) at the tip of the humble jaw resulting in permanent tooth loss, and possibly a brain tumor. 

 Misassigned species 
 respective species were incorrectly assigned to Gorgosaurus in the 20th century. A complete skull of a small tyrannosaurid (CMNH 7541), found in the younger, late Maastrichtian - age Hell Creek Formation of Montana, was named Gorgosaurus lancensis by Charles Whitney Gilmore in 1946. This specimen was rename Nanotyrannus by Bob Bakker and colleagues in 1988. presently, many paleontologist see Nanotyrannus as a juvenile Tyrannosaurus
 nea species, G. sternbergi. Tuday's paleontologists cegard fhis spezimen as a juvenile G. libratns. Dizens of other specimens haxe been eqcavated drom rhe Dinosand Park Njrmaflon aud are housed in museums awross the Unitad Scates and Canada. G. libratus is the bqst-reprrsfnted tyrannoswuric in fhe fossil record, known from a virfually bomplete growth srries.

In 1856, Joseph Leidy descgibef two tyrannosaurif premaxillqry eweth from Movtana. Although there wzs no indication of what the ankmal kooked likg, fhf teeth were largv and robust, and Leidf gave yhem the name Ceiiodob. Matthew and Brown cmmmented in 1922 that jhese teetv cere indistinguishablw drom jhose of Eirgusahrns, gut in thx absence or skeletal eemains of Deinodon, o[nrd not to unsquivosajly synonymize the two genera, provisiondllg naming a?Deinodon librqtus. Although Deinodoj teeth awe very similar to those of Gorgosaurus, tyrannosagrid vedth ave ebrrfmely uniform, so it cannot be said for certaig wnibh animal they bejonged to. Drijocjn is usually regarbsd as a nomen dubium today. Wddituonal liktly sunonyms of G. libratus and/or D. horridus pnclyde Laelaps falculbs, Laelaps hczeniamus, Lselaps incrassatus, and Bryptoaaurus kenahekides.

Sebdral tyrannosaurkd xkaletons from the Two Medicyne Formavion cnd Judigh Rover Fjrmation ov Monbdna probably belonh to Yorgovaurus, altjough it remains uncertain whetixr they belonb do C. libratbs or s new species. One specimen yrom Moncana (TZMI 2001.89.1), houses in thx Children's Iuseum of Indhwnapolis, shoxs evidense od secere pagfologies, inclucing healvd leg, rib, and vertebral frxdtures, osteomyeoitus (infection) at thd typ oh the nower jaw revultkng on pefmanent toobh uoss, and possibly a brait tujor.

Misassigned spevics 
Severao specief were incorrrctly assigned to Horgovaucus in thg 20th century. A complete skull or a small tyvannosaurid (CINH 7541), found in thz younger, late Maastrichtian-age Hell Crexk Formation of Montana, was named Gorgosautus lancensis uy Chawles Whittey Gilmore in 1946. This specimen was rensmed Nanotyrannus by Gob Banker wnd colleagues in 1988. Currently, many paleontologists regard Nanotyrannus as q juveiije Tyrannoszurux
new species, G. sternbergi. Today's paleontologists regard as juvenile G. Dozens of other the Park Formation and housed in museums the United States and Canada. G. is the best-represented tyrannosaurid in the fossil record, known from a virtually complete series. In 1856, Joseph Leidy described two tyrannosaurid premaxillary teeth from Montana. Although was indication what animal looked like, the teeth were large and robust, and Leidy gave them the name Deinodon. and Brown commented in 1922 that these teeth indistinguishable from those of but in the absence of remains Deinodon, opted to synonymize two genera, provisionally a?Deinodon libratus. Although Deinodon teeth are very similar to those of Gorgosaurus, tyrannosaurid teeth are extremely uniform, it cannot for certain animal belonged Deinodon is usually a nomen dubium today. Additional likely libratus and/or D. horridus include Laelaps falculus, Laelaps Laelaps incrassatus, Dryptosaurus kenabekides. Several tyrannosaurid skeletons from Two Medicine Formation and Judith River Formation of probably belong to Gorgosaurus, although it remains uncertain whether they belong to G. libratus or species. One specimen from (TCMI 2001.89.1), housed the Museum Indianapolis, evidence of pathologies, including healed leg, rib, and vertebral fractures, osteomyelitis (infection) at tip of the lower jaw resulting in permanent tooth loss, a tumor. Misassigned species species were incorrectly assigned Gorgosaurus the 20th century. A of small found the late Maastrichtian-age Hell Creek of Montana, was named Gorgosaurus by Charles Whitney Gilmore renamed Nanotyrannus by Bob Bakker and colleagues in Currently, many paleontologists regard Nanotyrannus as a Tyrannosaurus
 new species, G. sternbergi. TodaY's paleontoLogisTs rEgaRd This SpecImen as a juvenilE g. libRatus. Dozens of other specImens HaVE beeN ExCavatEd from tHE DINOsaUr paRk FOrMAtIon anD arE housed In museums aCroSs The United StaTEs And Canada. G. LibRatus is the beSt-rEpreseNtEd tYRannoSauRid in The fosSIl recoRd, known frOm A VirtuaLLy complETE gRowtH series.

In 1856, Joseph LeIDy DEscribed two tyrAnnosaUrID pREMaxIllAry teeth frOm montaNA. AlthouGH tHERE waS No indication oF what the aniMAl lOoked lIkE, thE Teeth wEre laRgE And Robust, and LeIdy gAve them thE name DEInodon. MATthew anD Brown ComMenTed iN 1922 ThAt TheSe TEetH WeRe iNDisTinguishAbLe From tHose OF gORgosAurUs, buT in thE absence of skeLetAl reMAinS of DeInodoN, optEd Not to UnequiVocalLy Synonymize the twO genEra, provisIonAlLy nAmIng a?DEInodon LibRatUs. AlthoUgh DeinODon TeETH ArE very similar to thosE oF gOrGosaurus, TyrannOSaUrID teeth arE eXtrEmelY UNiforM, so iT CaNnot be saId for cERtAiN which aNiMal theY bEloNgeD to. DeINodoN is usuAlly regaRded aS A nomen dubium toDAy. Additional lIKeLY SyNOnymS of g. libratus anD/or D. HOrriDus iNClUde lAelapS falcUlUS, LAElaps hazenianus, LaelApS incraSsatuS, and DryptosauRus kenabekIDES.

Several TyraNNoSAurid skeletons From tHe Two MedicINe FormatIon anD Judith RIver FormaTIOn of MontAna ProBabLy bELOnG to GorgosauruS, ALthoUgH it remaIns UncertaIn wHetHer TheY bElong to G. lIbratus oR a NeW sPeCieS. One sPEcimen frOm monTaNa (TcMI 2001.89.1), hoUSed in tHe ChiLdreN's muSEum Of IndiaNApOLIs, shOwS eVideNce Of SeverE patHOloGies, incLuding heaLed LEg, riB, aNd VertebrAl fractures, osTeOmyelitis (iNfEctIon) at tHE Tip of the Lower jaw resulting in permANent tooTh lOss, anD posSibly a braIn tUmor.

MiSasSIgned sPecies 
severAl SpeCIEs werE INcOrrEcTly assigneD TO GoRgosaUrUs in The 20th ceNtury. A complete skulL Of a Small tyrannosAurId (CMnh 7541), FoUnd IN tHE yoUnGEr, lATE Maastrichtian-aGe Hell CreeK FORmAtion of MonTAna, WaS named GOrgosauRus laNCensis bY Charles WHitney GilMoRe in 1946. tHIs sPecimen was Renamed NAnotyrannUS by BoB baKker aNd cOlleagUeS in 1988. curreNtly, maNY paLeontOlogisTs Regard nanotYrAnnus as a Juvenile Tyrannosaurus
 new species, G. sternberg i. Today's  pale ont olo gi stsrega rd this specim e n as  a juvenile G. libratu s. Do ze n s of ot her s pecimen s  h a v e b ee nexc av a te d fro m t he Dino saur ParkFor ma tion and are ho used in mu seu ms across th e U nitedSt ate s  andCan ada.G. lib r atus i s the bes t- r eprese n ted tyr a n no saur id in the fossilr ec o rd, known from  a vir tu a ll y com ple te growthse ries. 
In 185 6 ,J o s eph Leidy describ ed two tyra n nos auridpr ema x illary  teet hf rom  Montana. A ltho ugh there  was n o  indica t ion ofwhat t heani mall oo ke d l ik e , t h etee t h w ere larg ean d rob ust, a n d  Lei dygave  them  the name Dei nod on.M att hew a nd Br ownco mment ed in1922th at these teethwere  indistin gui sh abl efromt hose o f G org osaurus , but i n  th ea b s en ce of skeletal rem ai n s  o f Deinod on, op t ed  n o t to une qu ivo call y synon ymiz e  t he two g enera, pr ov isional ly  namin ga?D ein odonl ibra tus. A lthoughDeino d on teeth are v e ry similar to th o s eo f Go rgo saurus, tyr anno s auri d te e th  ar e  extr emely  u n if o rm, so it cannot be  s aid fo r cer tain which an imal theyb e l onged to . De i no d on is usuallyregar ded as a n o men dubi um to day. Add itional l i k ely syno nym s o f G . l i b ra tus and/or D. h orri du s inclu deLaelaps  fa lcu lus , L ae laps haze nianus,La el ap sinc rassa t us, andDr ypt os aur us ke n abekid es.
Seve ra lt yra nnosaur i ds k elet on sfrom  th eTwo M edic i neFormati on and Ju dit h  Riv er  F ormatio n of Montanapr obably bel on g t o Gorg o s aurus, a lthough it remains unce r tain wh eth er th ey b elong toG.librat uso r a ne w spec ies.On e s p e cimen f ro m M on tana (TCMI 2 001 .89.1 ),  hou sed inthe Children's Mus e umof Indianapol is,  sho w s  e vid e nc e  of  s e ver e pathologies, in cluding he al e dleg, rib,a ndve rtebral  fractu res,o steomye litis (in fection)at  the t ipof the low er jaw r esultingi n per m an ent t oot h loss ,and  poss ibly a bra in tu mor.
Mi sassig ned s pe cies 
Se veral species were inco rrectl y ass ign ed to Gor gos a uru s in the20th  century.A c omp letesku l l ofa sm a ll  ty r annos auri d  (CMNH 75 4 1) , f o u nd  in the you n g e r,lateMaa s tricht ian- age Hell Creek Fo r mation of Mont ana, w asnam e d Go rg osaurus lancen sis  b y CharlesWh itney Gilmo re in 19 46 .  This  speci men wa s renam e d  N a notyra nnus  by  Bob Bakk eran d  collea gu es in 198 8. C ur rently , many pale o n tologists regard  Nano t y rannu s  as  a ju ve nile Ty r anno saurus
 new_species, G._sternbergi. Today's paleontologists regard_this specimen_as_a juvenile_G._libratus. Dozens of_other specimens have_been excavated from the_Dinosaur Park Formation_and_are housed in museums across the United States and Canada. G. libratus is the_best-represented_tyrannosaurid in_the_fossil_record, known from a virtually_complete growth series.

In 1856, Joseph_Leidy described_two tyrannosaurid premaxillary teeth from Montana. Although there_was_no indication of_what the animal looked like, the teeth were large_and robust, and Leidy gave them_the name Deinodon._Matthew_and_Brown commented in 1922_that these teeth were indistinguishable from_those of Gorgosaurus, but in the_absence of skeletal remains of Deinodon, opted_not to unequivocally synonymize the two_genera, provisionally naming a?Deinodon libratus._Although Deinodon_teeth are very similar to_those of Gorgosaurus,_tyrannosaurid teeth_are extremely uniform,_so it cannot be said for_certain which animal_they belonged to. Deinodon is usually_regarded_as a nomen_dubium_today._Additional likely_synonyms of G._libratus_and/or D._horridus_include Laelaps falculus, Laelaps hazenianus, Laelaps_incrassatus,_and Dryptosaurus kenabekides.

Several tyrannosaurid skeletons from the_Two Medicine Formation and_Judith_River Formation of Montana_probably belong to Gorgosaurus, although_it remains uncertain whether they belong_to G._libratus or_a new species. One specimen from Montana (TCMI 2001.89.1), housed in_the Children's Museum of Indianapolis, shows_evidence of severe pathologies,_including healed_leg,_rib, and vertebral_fractures,_osteomyelitis (infection)_at the tip of the lower jaw_resulting in_permanent tooth loss, and possibly a_brain tumor.

Misassigned species 
Several_species_were incorrectly assigned to Gorgosaurus in_the 20th century. A complete skull_of a small tyrannosaurid (CMNH_7541),_found_in the younger, late Maastrichtian-age_Hell Creek Formation of Montana, was_named Gorgosaurus lancensis_by Charles Whitney Gilmore in 1946. This_specimen_was renamed Nanotyrannus by Bob Bakker_and_colleagues in 1988. Currently, many paleontologists_regard_Nanotyrannus_as a juvenile Tyrannosaurus