The Komodo Dragon (Varanus komodoensis) only lives on the Indonesian islands of Komodo, Rinca, Flores, and Gili Motang. With only 1.400 dragons left in the wild, they're classed as Endangered. The reasons for their decline are plentiful: habitat loss (mainly due to human encroachment into their environments), loss of their preferred prey (again due to humans overhunting the deer they eat), and volcanic activity on the islands which destroys both large numbers of dragons and their nests at the same time. To prevent them from going extinct they are now protected by Indonesian Law and the Isle of Komodo has been declared a National Park to aid in the conservation of the species.
Komodo Dragons can be fairly easily separated into male and female dragons. The males average in length around 2.60 meters and usually weigh between 79-91 kilos. Females average around 2.30 meters in length and weigh between 68-73 kilos. And despite their slow distinctive snaking-like walking movement, they can run up to roughly 19 km/h when chasing prey. Their size also matters when it comes to dinner time since the feeding order is based on size.
Despite female dragons being capable of laying viable eggs without mating, those hatchlings are solely male, making it difficult to have a viable breeding program in captivity (which is also made difficult by the fact that dragons are monogamous in their mating habits).
Komodo Dragons have an ambush-strategy when it comes to hunting: they lie in wait and go for the throat once they attack. Part of their kill-mechanism is that they apply potent venom onto multiple frenzied bit wounds from their sharp teeth. The venom rapidly decreases blood pressure and expedites blood loss, causing victims to collapse from blood loss and shock after the initial attack, making them too weak to escape or fight back. Due to their anatomy, dragons can swallow prey whole up to the size of a goat or a small deer. After such a large meal they'll slowly digest it and regurgitate any fur, horns, and bones remaining.
Fun fact: Komodo Dragons are cannibalistic: 10% of an adult's diet consists of juvenile dragons (this too adds to the decrease in population).