Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Family: Hadrosauridae
Subfamily: Lambeosaurinae
Genus: Lambeosaurus

Lambeosaurus was one of the longest ornithopods (up to 15m) when it lived about 75 million years ago in the late Cretaceous. It can be distinguished from other genera within the family by the distinctive 'hatchet' crest located on the head. Scientists have largely settled on the idea that the crest is a vocalization device used to signal or attract members of the same species. Subtle variations in the shape and size of these crests may indicate that these features are sexually dimorphic, in addition to being age-related.

Type Species: Lambeosaurus lambei

Parks, WA. (1923). "Corythosaurus intermedius, a new species of trachodont dinosaur". University of Toronto Studies, Geological Series 15, pp. 1–57.

Locality:

Dinosaur Park Formation, Alberta, Canada.

Scientific Resources:

Evans, DC; and Reisz, RR. (2007). Anatomy and Relationships of Lambeosaurus magnicristatus, a Crested Hadrosaurid Dinosaur (Ornithischia) from the Dinosaur Park Formation, Alberta. Journal of Vertebrate Paleontology, Vol. 27, Issue 2, pp. 373-393.

Evans, DC. (2006). Nasal cavity homologies and cranial crest function in lambeosaurine dinosaurs. Paleobiology, Vol. 32, Issue 1, pp. 109-125.

Weishampel, DB. (1981). Acoustic Analyses of Potential Vocalization in Lambeosaurine Dinosaurs (Reptilia: Ornithischia). Paleobiology, Vol. 7, No. 2, pp. 252-261.

Sternberg, CM. (1954). Classification of American Duck-billed Dinosaurs. Journal of Paleontology, Vol. 28, No. 3, pp. 382-383.