Bearded Dragon

The inland, or central, bearded dragon is an Australian lizard of the family Agamidae, named for the throat pouch that it can inflate and darken. It lives in semiarid and arid woodland and rocky desert across inland New South Wales, the Northern Territory, Queensland and South Australia. Skilled climbers, these lizards bask on branches, fence posts and rocks in the morning and evening and shelter from the afternoon heat. They are opportunistic omnivores; in one analysis of summer diets, plant matter made up 54% of food by volume. Rather than vocalising, they communicate with colour, posture, arm waving and head bobbing.

About the bearded dragon

The central bearded dragon, also called the inland bearded dragon, is a species of lizard native to eastern and central Australia. It belongs to the family Agamidae and was first described by the German zoologist Ernst Ahl in 1926, who originally placed it in a different genus before it was later reclassified into Pogona. Its common name comes from the pouch of skin under its chin, which it can inflate and darken, much like the display of the frilled lizard.

A mature bearded dragon reaches a total length of around 60 cm (24 in) and can weigh up to 550 g (1.2 lb), with the tail making up more than half of that length. Males are generally larger than females and can be told apart by a wider cloacal opening, a broader tail base, a bigger and more angular head, a more developed "beard," and more pronounced femoral pores — waxy bumps visible on the underside of the back legs. Coloring ranges across a blend of light brown, reddish-brown, red, yellow, white, and orange, and decades of selective breeding by hobbyists have produced numerous additional color "morphs." Like chameleons, bearded dragons can shift their coloration somewhat based on mood, and a 2014 study found the species has an internal circadian rhythm governing pigment changes — the skin darkens with sun exposure and lightens in darkness, reaching its lightest under constant darkness.

The lizard's pointed throat and body scales can be raised by inhaling air to full lung capacity, making the animal look larger to a predator, even though those spiky-looking scales are actually soft to the touch. When cornered, a bearded dragon flattens its body, expands its ribcage, opens its mouth, and extends its beard — the pouch that darkens further during threat displays, courtship, or territorial disputes, usually more so in males. Like other agamid lizards, it can lift its whole body off the ground on its legs while moving, which reduces heat absorbed from hot ground and improves airflow underneath it. Many Pogona species, including this one, also carry a "third eye" — a parietal eye on the forehead that regulates hormones and temperature sensing, and a 2020 study found it can detect magnetic fields when exposed to light under 580 nanometers.

Behavior and diet

Bearded dragons are skilled climbers that spend as much time basking on tree limbs, fence posts, and in bushes as they do on the ground, typically sunning themselves in the morning and evening and retreating to shade or burrows during the hottest part of the afternoon. As opportunistic omnivores living in a food-scarce environment, they aren't picky eaters: their stomachs handle large amounts of vegetation, fruit, insects, worms, and the occasional small rodent or lizard. Favored insect prey includes crickets, grasshoppers, beetles, caterpillars, and moths, along with mealworms and vegetables like parsley, kale, pepper, and sweet potato. One study of wild adults' summer diet found termite alates made up 26 percent of food volume when seasonally available, with plant matter making up 54 percent.

Bearded dragons don't vocalize beyond a soft hiss when threatened; instead they communicate through color, posture, and gestures such as arm-waving and head-bobbing. They aren't a social species, but will gather at good feeding or basking spots, where a hierarchy forms — the highest-ranking animals claim the sunniest perches. A slow head bow typically signals submission, most often from an adult female to a male; a fast head bob signals male dominance, often paired with a darkened, inflated beard; and a more violent bob precedes mating. A female ready to mate will wave an arm and follow with a slow head bob, while a gravid female refusing a male's advances may chase him and lie on her back. Under direct attack, the lizard opens its mouth to show yellow membranes, extends its beard, darkens its skin, flattens its body, hisses, and makes small jumps toward the attacker — though bearded dragons aren't known to attack people. Adult males can bite more forcefully than females, a difference tied to their larger heads. Bearded dragons have also demonstrated social learning: in one experiment, after a single individual was trained to open a door to reach food, most others that watched were able to copy the behavior.

Breeding typically happens in early spring. A female lays a clutch of 11 to 30 oblong eggs in a shallow sand nest; the eggs are then buried and left unattended, hatching in roughly 60 to 80 days depending on incubation temperature. Notably, the species uses a ZW sex-determination system, but a 2015 study found that eggs incubated above about 32°C (90°F) cause genetically male (ZZ) embryos to reverse sex and develop as fertile females — ones that can lay nearly twice as many eggs as standard ZW females, and whose offspring, when bred with ZZ males, are exclusively ZZ. Juvenile sex-reversed females act more like males — bolder, more active, preferring higher temperatures — though that behavioral difference fades with age, and adults are physically indistinguishable from standard females.

Range and habitat

Pogona vitticeps is native to semiarid woodland, arid woodland, and rocky desert of central Australia, chiefly the inland regions of New South Wales, the Northern Territory, Queensland, and South Australia. Within that range it makes use of tree limbs, fence posts, and shrubs as well as open ground, and shelters in shade or burrows to avoid the hottest part of the day.

Conservation status

The bearded dragon is listed as Least Concern. Most captive-bred lines in the pet trade descend from animals illegally exported from Australia between 1974 and 1990, after Australia banned wildlife exports in the 1960s; a captive-bred global population was established by the early 1990s, and a 2021 study identified the bearded dragon as the most commonly kept reptile species in the United States and Western Europe. In captivity, the animals face a few notable health issues: Agamid adenovirus 1, which can cause liver disease and enteritis and is more dangerous in juveniles; and Metabolic Bone Disease, caused by inadequate UVB lighting and dietary calcium, which prevents the lizard from synthesizing vitamin D3 and leads to calcium loss from the skeleton. Selectively bred "Silkback" dragons, which lack scales entirely, lose water through evaporation at twice the rate of normal dragons, making dehydration a particular risk for that morph.