Reptiles
Bearded Dragon
Pogona · also called beardie, central bearded dragon
A bearded dragon is a stocky desert lizard from the dry heart of Australia that, within about sixty years, has gone from a reptile almost nobody outside the country had heard of to the most kept pet lizard on Earth. It earned it: it is calm, alert by day, easy to keep, and full of visible behaviour — flaring a black spiny beard when alarmed, waving an arm in submission, bobbing its head to assert rank.
Overview
Bearded dragons are the genus Pogona, eight species across arid and semi-arid Australia, most famously the central (inland) bearded dragon of the continent’s dry interior. They are omnivores — insect-heavy as juveniles for growth, more plant-based as adults — and they need elevated basking sites like rocks, logs, and fence posts.
Body language
The beard is a spiny throat pouch the dragon flares and darkens to black to look bigger, in threat and in courtship. Arm-waving — one foreleg circled slowly — signals submission; rapid head-bobbing asserts dominance. To warm up, a dragon pancakes flat against a rock to catch the sun; to cool, it gapes and seeks shade. In cool months it brumates, a reptile hibernation.
Sex set by heat
Bearded dragons have sex chromosomes, but a genetically male egg incubated above about 32 °C hatches as a functional, egg-laying female — and these sex-reversed females lay larger clutches. Hotter regions and years therefore produce female-skewed wild populations, a concern under climate warming.
Status
Least Concern and stable — common across arid Australia, tolerant of farmland, and the vast pet population is entirely captive-bred, so the trade does not touch wild animals. Local threats are road strikes (dragons bask on warm roads), feral cats and foxes, and heat-skewed sex ratios.
Bearded Dragon: common questions
Why are bearded dragons such popular pets?
They tick almost every box for a beginner reptile. They are a manageable size, around 40 to 60 centimetres including the tail, generally calm and tolerant of gentle handling, active and alert during the day so their owners see them behaving, and expressive, with the beard display, arm-waving, and head-bobbing giving them a lot of personality. They are hardy and long-lived, commonly reaching 8 to 12 years and sometimes more, and they are bred in huge numbers in a wide range of colours and patterns, so captive-bred, healthy animals are easy to obtain. The main caveats are that they need a large enclosure, strong heat and UVB lighting, and a varied omnivorous diet, and that they can carry salmonella, so hand-washing after handling is important.
What does it mean when a bearded dragon waves its arm?
Arm-waving is a communication signal, not a greeting or a sign of friendliness as it is sometimes taken to be. A bearded dragon lifts one front leg and rotates it slowly in a circle, usually while lowering its body, and it means roughly I see you and I am not a threat. It is most often shown by a smaller or subordinate dragon toward a larger one, by a female toward a courting male, or by any dragon toward something it perceives as dominant, which can include a much bigger tankmate or even a person or a reflection. Frequent waving in a lone pet can indicate the animal feels stressed or crowded by something in or near its enclosure.
Can a bearded dragon really change sex?
Not as an adult, but its sex can be set by temperature during incubation, overriding its chromosomes. A bearded dragon embryo that is genetically male, carrying the ZZ sex chromosomes, will still hatch and develop as a fully functional, egg-laying female if the egg is incubated above roughly 32 degrees Celsius. These sex-reversed females are genetically male but reproductively female, and studies show they actually lay larger clutches than normal females. In the wild this means hotter regions and hotter years produce female-skewed populations, and there is concern that climate warming could push some wild populations toward too few genetic males.
What is the difference between a bearded dragon and a frilled lizard?
Both are Australian agamid lizards with a dramatic threat display, but the displays and lifestyles differ. A bearded dragon is a stocky, ground-dwelling desert lizard that flares a spiny black throat pouch, the beard, and puffs up in place. A frilled lizard is a more slender, longer-legged, semi-arboreal lizard of northern woodlands that, when alarmed, opens a huge circular ruff of skin around its neck like an umbrella, gapes its bright mouth, hisses, and often runs away on its hind legs. The frilled lizard is larger, up to about 90 centimetres, spends much of its time in trees, and is far more skittish, while the bearded dragon is calmer and rarely climbs high.