The Northern Bluetongue Skink is the largest of the bluetongues, growing up to 60 cm. They are found across northern Australia, and feed on insects, vegetation, and small vertebrates. Northern Bluetongue Skinks have been severely impacted by the invasive cane toad. In areas where cane toads have been introduced, skinks have disappeared, or are significantly impacted and vulnerable to other threats such as fire and overgrazing by livestock. Due to this as well as the significant habitat loss the skinks were recently added to the list of critically endangered animals.

The National Zoo & Aquarium is home to 3 Northern Bluetongue Skinks: Gumnut, Myrtle, and Wattle.