A Tiliqua, or a Blue-tongued skink as they are known by, make up the Australasian genus Tiliqua, which has some of the largest members of skinks.

Types include: Tiliqua gigas evanescens (Merauke blue-tongued skink), Tiliqua Gigas (Indonesian blue-tongued skink), Tiliqua scincoides (Common blue-tongued skink), Tiliqua rugosa (Shingleback skink), Tiliqua nigrolutea (Blotched blue-tongued skink), Tiliqua multifasciata (Centralian blue-tongued skink), Tiliqua scincoides intermedia (Northern blue-tongued skink), Tiliqua scincoides scincoides (Eastern blue-tongued skink), Tiliqua occipitalis (Western blue-tongued skink), Tiliqua adelaidensis (Adelaide pygmy blue-tongued skink), and Tiliqua sp. (Irian Jaya blue tongue skink).

Not much is known about Tiliqua sp. and it has yet to be classified scientifically.

The Adelaide pygmy blue-tongued skink was thought to be extinct before being rediscovered in 1992. They are now classified as an endangered species.

The Merauke blue-tongued skink is the largest in length, tending to grow at sizes of 26-30 inches (66-76 cm) in length. The Northern blue-tongued skink is considered to be the largest in weight, being about 10-18 oz in weight.

They use their blue tongues to startle predators, hissing and puffing up their bodies to scare away predators.

They give birth to live young instead of laying eggs. Most reptiles lay eggs, but some do not lay eggs. This reptile is an example of a viviparous reptile.

Like snakes, their tongues help them pick up scents and identify objects as their tongue picks up particles from the air and objects.