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Temporal range: Late Cretaceous
Tumblr nw0w0c2r5y1uswz2lo1 1280.jpg
An artist's illustration of Nanuqsaurus hoglundi
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Sauropsida
Suborder: Theropoda
Family: Tyrannosauridae
Subfamily: Tyrannosaurinae
Genus: Nanuqsaurus
Fiorillo & Tykoski, 2014
Species: N. cheloniformis
Binomial name
Nanuqsaurus hoglundi
Fiorillo & Tykoski, 2014

Nanuqsaurus (meaning "polar bear lizard") is an extinct genus of tyrannosaurid from late Cretaceous Alaska, USA, from the Prince Creek Formation. The holotype was dated to 69.1 MYA. The skull was estimated at 24-28 inches. The animal itself was 6 long

Material Edit

The holotype material consists of partial remains of a skull and lower jaw.


The holotype material of Nanuqsaurus.

Because of the incomplete state of preservation for the holotype remains,‭ ‬only a best guess is available for the size estimate of Nanuqsaurus.‭ ‬This however does show that if the‭ ‬adult size was about six meters long,‭ ‬then Nanuqsaurus would have been relatively small for a tyrannosaur,‭ ‬especially a genera alive in the late Cretaceous.‭ ‬It is possible that the small size of Nanuqsaurus may have been a result of living in its environment,‭ ‬especially if prey resources were scarce.‭ ‬Also of interest is that other predatory dinosaurs of the region such as Troodon are known to have grown half as big again as their southern relatives.‭ ‬Gigantism is a surprisingly common method that animals adopt to cope with colder climates because the greater mass of their bodies offers more insulation for the internal organs,‭ ‬so the reduction in size for Nanuqsaurus again seems to be driven by the availability of food.



Nanuqsaurus Makes its first media appearance in the new Dino Dan Series Dino Dana.



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