The Komodo dragon prefers hot and dry places, and typically lives in dry, open grassland, savanna, and tropical forest at low elevations. As an ectotherm, it is most active in the day, although it exhibits some nocturnal activity

In the wild, adult Komodo dragons usually weigh around 70kg, although captive specimens often weigh more. According Guinness World Records, an average adult male will weigh 79 to 91 kg and measure 2.59m, while an average female will weigh 68 to 73 kg and measure 2.2 m. The largest verified wild specimen was 3.13m long and weighed 166 kg, including its undigested food.

The Komodo dragon has a tail as long as its body, as well as about 60 frequently replaced, serrated teeth that can measure up to 2.5 cm in length. Komodo dragon skin is reinforced by armoured scales, which contain tiny bones called osteoderms that function as a sort of natural chain-mail. Additionally, these osteoderms become more extensive and variable in shape as the Komodo dragon ages, ossifying more extensively as the lizard grows. These osteoderms are absent in hatchlings and juveniles, indicating that the natural armor develops as a product of age and competition between adults for protection in intraspecific combat over food and mates.

Komodo dragons are carnivores. Komodo dragons eat by tearing large chunks of flesh and swallowing them whole while holding the carcass down with their forelegs. The Komodo dragon's diet is wide-ranging, and includes invertebrates, other reptiles (including smaller Komodo dragons), monkey, bird, etc. Young Komodos will eat insects, eggs, geckos, and small mammals, while adults prefer to hunt large mammals.

Mating occurs between May and August, with the eggs laid in September. During this period, males fight over females and territory by grappling with one another upon their hind legs, with the loser eventually being pinned to the ground. The winner of the fight will then flick his long tongue at the female to gain information about her receptivity. Female Komodos lay their eggs from August to September and may use several types of locality. In one study, 60% laid their eggs in the nests of orange – footed scrubfowl, 20% on ground level and 20% in hilly areas. Clutches contain an average of 20 eggs, which have an incubation period of 7–8 months. Young Komodo dragons spend much of their first few years in trees, where they are relatively safe from predators, including cannibalistic adults, as juvenile dragons make up 10% of their diets.

According to en.wikipedia