The Canadian Encyclopedia — neutral, cited, updated
July 26, 2026Sources cited
Canadianwire.
Canada’s encyclopedia & explainer
Home›Science & Nature›Dinosaurs›Nanuqsaurus
Science & Nature • Dinosaurs

Nanuqsaurus

Nanuqsaurus is a genus of tyrannosaurine theropod dinosaur from Late Cretaceous Alaska.

By Ethan Anderson| Reviewed by Olivia Bennett, Standards & Fact-Checking Lead| Updated July 26, 2026|2 min read| Fact-checked

Nanuqsaurus is a genus of tyrannosaurine theropod dinosaur from Late Cretaceous Alaska. It is known from fragmentary fossil material and includes a single named species, Nanuqsaurus hoglundi. The name means “polar bear lizard,” reflecting its Arctic provenance and the Inupiat word nanuq for polar bear.

Discovery and naming

Nanuqsaurus was identified from fossils found on Alaska’s North Slope. The genus name refers to polar bears and the Arctic region where the fossils were discovered.

Fossil material

The dinosaur is known mainly from a partial skull, with additional postcranial and tooth material not fully described in the sources provided. The incomplete remains make its exact size and anatomy difficult to reconstruct.

Classification and age

Nanuqsaurus is classified as a tyrannosaurine theropod dinosaur. It lived during the Late Cretaceous, specifically around the latest Campanian to Maastrichtian interval.

Palaeoenvironment

The fossils come from the Prince Creek Formation in northern Alaska. This indicates that Nanuqsaurus lived in a high-latitude Arctic ecosystem.

Key facts

  • Nanuqsaurus is an extinct tyrannosaurine dinosaur from Arctic Alaska.
  • Its name comes from the Inupiat word nanuq, meaning polar bear.
  • The genus contains one described species, Nanuqsaurus hoglundi.
  • The animal is known from limited fossil remains, especially skull material.
  • It lived in the Prince Creek Formation during the Late Cretaceous.

Frequently asked questions

What does Nanuqsaurus mean?
It means “polar bear lizard,” from the Inupiat word nanuq, meaning polar bear.
Where was Nanuqsaurus found?
Its fossils were found in the Prince Creek Formation on Alaska’s North Slope.
What kind of dinosaur was Nanuqsaurus?
It was a tyrannosaurine theropod, related to other tyrannosaurids such as Tyrannosaurus.
How many species are assigned to Nanuqsaurus?
One species is named: Nanuqsaurus hoglundi.
Is Nanuqsaurus known from a complete skeleton?
No. It is known from fragmentary material, mainly a partial skull and some additional remains.

References

  1. Wikipedia — https://en.wikipedia.org/wiki/Nanuqsaurus
    Supports: Genus name, classification, type species, and Alaska fossil locality.
  2. U.S. National Park Service — https://www.nps.gov/dena/learn/nature/nanuqsaurus.htm
    Supports: Meaning of the name, tyrannosaurid identity, Arctic Alaska context, and relative size.
  3. Nature — https://www.nature.com/articles/nature.2014.14859
    Supports: Scientific recognition of Nanuqsaurus hoglundi and its Arctic provenance.