This reptile is the largest species of dragon family of lizards in Australia. The Frilled-neck lizard is called due to its frill (ruff) - a fold of skin, surrounding its throat. The frill of the lizard is thin and extensive, usually lying folded up over the lizard's shoulders. When the animal is threatened or alarmed, the frill extends, rising abruptly. The colour of their skin varies depending on the environment, often matching tree bark, which makes the animal extremely difficult to detect. The mouth lining and tongue of the animal are yellow or pink. The Frilled-neck lizards have faint, dark grey stripe on the tip of their tails.
As many of their relatives, these lizards are carnivores (insectivores). They primarily feed upon insects such as moths and butterflies as well as consume beetles, termites and cicadas. They will also eat spiders, mice and even, other lizards.
The Frilled-neck lizards are polygynous. Mating season lasts from September to November, during which the males compete with each other for their mating rights. After mating, the female lays 1-2 clutches of 12-18 eggs. The eggs are laid in a small underground burrow and incubated during 50 -90 days. The sex of future breeds depends on temperature inside the burrow: higher temperatures yield males while cooler temperatures usually bring females. Parental care is not common among the frilled-neck lizards, and the hatchlings are fully independent. However, they remain together for the first 8-10 days of their lives. The young are able to frill and hunt as soon as they are hatched out. Sexual maturity is reached quite early - at 18-20 months old.