ExtensiveEkstenzivna [[bone bed]]s are knownnalazišta forkostiju ''EdmontosaurusEdmontosaurusa'',andi suchslične groupingsvelike ofgrupe hadrosauridsfosila aredrugih usedhadrosaurida tokoriste suggestse thatkao theydokaz wereda gregarious,su livingbili indruštveni groupsi živjeli u grupama.<ref name=HWF04/> FourČetiri quarrieskamenoloma containingsa edmontosaurostacima remainsedmontosaura areidentificirana identifiedu inbazi apodataka 2007o databasefosilnim ofnalazištima fossiliz bone2007. beds,godine fromsu: Alaska[[Aljaska]] (formacija Prince Creek Formation), Alberta (formacija Horseshoe Canyon Formation), SouthJužna Dakota (formacija Hell Creek Formation),andi [[Wyoming]] (Lanceformacija FormationLance).<ref name=bbdb07/> OneJedno edmontosaurnalazište boneu bed,formaciji fromLance [[claystone]]pokriva andviše [[mudstone]]od ofjednog thekvadratnog Lance Formation in eastern Wyomingkilometra, coversali more than a square kilometer, althoughkosti ''EdmontosaurusEdmontosaurusa'' bonessu arenajčešće mostu concentratedjednom indijelu analazišta površine {{convert|40| ha|sqmi}} subsection of this site. Procjenjuje Itse isda estimatedse thattu disassociatednalazi remains10 pertaining to 10,000 todo 25, 000 edmontosaurs areraštrkanih presentostataka hereedmontosaura.<ref name=ACetal06>{{cite journal |last=Chadwick |first=Arthur |coauthors=Spencer, Lee; and Turner, Larry |year=2006 |title=Preliminary depositional model for an Upper Cretaceous ''Edmontosaurus'' bonebed |journal=Journal of Vertebrate Paleontology |volume=26 |issue=3, suppl. |pages=49A }}</ref>
Unlike many other hadrosaurids, ''Edmontosaurus'' lacked a bony crest. It may have had soft-tissue display structures in the skull, though: the bones around the nasal openings had deep indentations surrounding the openings, and this pair of recesses are postulated to have held inflatable air sacs, perhaps allowing for both visual and auditory signaling.<ref name=JAH75/> ''Edmontosaurus'' may have been [[Polymorphism (biology)|dimorphic]], with more robust and more lightly built forms, but it has not been established if this is related to [[sexual dimorphism]].<ref name=GRetal03>{{cite journal |last=Gould |first=Rebecca |coauthors=Larson, Robb; and Nellermoe, Ron |year=2003 |title=An allometric study comparing metatarsal IIs in ''Edmontosaurus'' from a low-diversity hadrosaur bone bed in Corson Co., SD |journal=Journal of Vertebrate Paleontology |volume=23 |issue=3, suppl. |pages=56A–57A }}</ref>
