Total anky death
Extinct as can be!

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Temporal range: Late Cretaceous
Hypacrosaurus altispinus
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Superorder: Dinosauria
Order: Ornithischia
Family: Hadrosauridae
Subfamily: Lambeosaurinae
Tribe: Labeosaurini
Genus: Hypacrosaurus
Brown, 1913
  • H. altispinus Brown, 1913 (type)
  • H. stebingeri Horner & Currie, 1994

Hypacrosaurus is an extinct genus of lambeosaurine hadrosaur from late Cretaceous Canada and USA. It was about 32.8 feet (10 meters) long and weighed about as much as a rhino. Known from eggs and nests, juveniles through adults, and whole herds. On March 2020, paleontologists have found DNA and protein well preserved in the 75 million year old Hypacrosaurus skull.


Hypacrosaurus is most easily distinguished from other hollow-crested duckbills or lambeosaurines by its tall neural spines and the form of its crest. The skull's hollow crest is like that of Corythosaurus, but is more pointed along its top, not as tall, wider side to side, and has a small bony point at the rear. Unlike other lambeosaurines, the passages for the airways do not form an S-curve in the crest. The animal is estimated to have been around 9.1 meters long, and to have weighed up to 4.0 tons.

Similiar to other duckbills, it could change its anatomical stance and posture between bipedal and quadrupedal. The two known species, Hypacrosaurus altispinus and Hypacrosaurus stebingeri, are not differentiated in the typical method, of unique characteristics, as H. stebingeri was described as transitional between the earlier Lambeosaurus and later Hypacrosaurus.

Discovery and history[]

The type remains of Hypacrosaurus remains were collected in 1910 by Barnum Brown for the American Museum of Natural History.


Hypacrosaurus is classified as a member of Lambeosaurinae, it is closest to Lambeosaurus and Corythosaurus.


As a hadrosaurid, Hypacrosaurus would have been a bipedal/quadrupedal herbivore, eating a variety of plants. Its skull permitted a grinding motion analogous to chewing, and its teeth were continually replacing and packed into dental batteries that contained hundreds of teeth, only a relative handful of which were in use at any time. Plant material would have been cropped by its broad beak, and held in the jaws by a cheek-like organ. Its feeding range would have extended from the ground to about 4 meters.


H. stebingeri laid roughly spherical eggs of 20 by 18.5 centimeters, with embryos being 60 cm long. Hatchlings were around 1.7 meters long. Growth was faster than that of an alligator and comparable to ratite growth, for several years, based on the amount of bone growth seen between lines of arrested growth.

In popular culture[]

  • A couple Hypacrosaurus were seen in the final episode of the PBS Documentary “The Dinosaurs!: The Death of the Dinosaurs”, witnessing a cloud of dust rising & they begin to run away from it.
  • A group of Hypacrosaurus was seen on the 2001 Documentary Dinosaur Babies: The North American Story.
  • A family of Hypacrosaurus was in Discovery Channel's Documentary Dino Lab II.
  • Hypacrosaurus was probably originally planned to appear in the 2000 Disney Film Dinosaur, but was scrapped in the final product.