Bearded Dragon's

Pogona is a genus of reptiles containing eight lizard species (though some sources say nine or ten) which are often known by the common name bearded dragons. The name "bearded dragon" refers to the "beard" of the dragon, the underside of the throat, which can turn black for a number of reasons, most often as a result of stress. They are a semi-arboreal species, spending significant amounts of time on branches, in bushes, and near human habitation. Pogona species bask on rocks and exposed branches in the mornings and afternoons. They are found throughout much of Australia in a wide range of habitats such as deserts, shrublands and Eucalyptus woodlands.

Several species of this genus, especially the central bearded dragon, are often kept as pets. They can also be exhibited in zoos due to their hardy nature and easy care in comparison to other exotic reptiles.

The genus Pogona is in the subfamily Amphibolurinae of the lizard family Agamidae. Characteristics include broad, triangular heads and flattened bodies with spiny scales arranged in rows and clusters. These are found on the throat, which can be expanded when threatened, and at the back of the head. These scales are used to scare off predators, yet they are not very sharp. Bearded dragons display a hand-waving gesture to show submission (most often when acknowledging another bearded dragon's territory), and a head-bobbing display to show dominance between dragons. Some have the ability to slightly change colour during rivalry challenges between males, in response to ambient temperature changes such as turning black to absorb heat, and other stimuli. Males grow up to 60 cm (24 in) long, and females up to 51 cm (20 in). Bearded dragons also produce a mild venom originating from primitive venom glands. Although generally harmless towards humans, it is effective towards smaller-sized animals.

Bearded dragons originate from deserts in Australia, with the various species occupying slightly overlapping areas of the landmass. They live in the arid and subtropical woodlands, scrublands, savannas, shore areas, and into the great interior deserts. Their range extends throughout the interior of the eastern states to the eastern half of South Australia and southeastern Northern Territory. They are considered to be semi-arboreal and will quite readily climb and bask at height. This is also linked to dominance behavior and competition for territory/basking areas. They can be found on fallen/broken trees, rocky outcrops and bushes when basking.

Bearded dragons go through a type of hibernation called brumation. Brumation is like hibernation where reptiles go months without eating but they sporadically drink water. Reptiles go dormant in the hottest temperatures, but it differs from brumation during cooler temperatures. When temperatures are extreme, there is a very small range between temperatures that the reptile's bodies can stay active and where their body cannot tolerate the extreme heat and they die. Bearded dragons go through brumation when the temperature goes below 60–70 °F during the night and 75–80 °F during the day for eight to ten hours. When the climate is too hot they will often burrow underground. They will also form more permanent burrows or covered hiding places to use as protection from the climate changes at night and predation.

Adult bearded dragons are very territorial. As they grow, they establish social hierarchies in which displays of aggression and appeasement form a normal part of their social interactions. A dominant male will adopt a dominant stance and sometimes ready himself for a fight to attack a male aggressor to defend territory, food sources, or in competition for a female. Any male approaching without displaying submissive behavior will be seen as a challenge for the territory. Aggressive males have even been known to attack females who do not display submissive gestures in return.

Correspondingly, adult male bearded dragons can bite more forcefully than adult females and this difference is associated with greater head dimensions.

Bearded dragon with mouth agape.

The bearded dragon comes in many different colors. The beard itself is used for both mating and aggression displays and forms part of a range of gestures and signals through which the dragons have basic levels of communication. Both sexes have a beard, but males display more frequently, especially in courtship rituals. Females also display their beard as a sign of aggression. The beard darkens, sometimes turning jet black, and inflates during the display. The bearded dragon may also open its mouth and gape in addition to inflating its beard to appear more intimidating. Extreme behavior such as hissing can be observed when threatened with a predator, inflating the body and tilting towards the threat in defense. Bearded dragons have relatively strong jaws but will often only attack as a last resort when threatened outside of competition with their own species.

Head bobbing is another behavior seen in both females and males; they quickly move their head up and down, often darkening and flaring their beard. Changes in the pace of head bobbing are thought to be a form of communication. Males head bob to impress females, and a male will often have to demonstrate his dominance when attempting to mate before the female will concede. Smaller males will often respond to larger males head bobbing by arm-waving, which is a submissive sign. Females will also arm wave to avoid aggression, often in response to a male's head bobbing. Female bearded dragons have been seen lowering themselves towards the ground and intermittently arm-waving whilst moving away from a dominant male in an attempt to either appease or escape.

The bearded dragon has also shown to perceive illusion, specifically the Delboeuf illusion. In an experiment at the University of Padua, bearded dragons were presented with two different sized plates with the same amount of food. The bearded dragons chose the smaller plate more often than they chose the larger one, showing that they were able to perceive the illusion and interpret that a larger plate does not always mean more food. This is the first evidence of this behavior being shown in a reptile species.