The Bengal monitor (Varanus bengalensis) or common Indian monitor, is a monitor lizard found widely distributed over the Indian Subcontinent, as well as parts of Southeast Asia and West Asia.This large lizard is mainly terrestrial, and its length can range from about 61 to 175 cm from the tip of the snout to the end of the tail.Varanus niloticus has been demonstrated to be capable of parthenogenesis. Males, however, begin to show combat behaviour in April.
The number of ventral scales varies, decreasing from 108 in the west to 75 in the east (Java).
Young monitor lizards are more colourful than adults.
This allows for greater rates of gas exchange and allows a faster metabolic rate and higher activity levels.
Like all varanids, they have subpleurodont teeth, meaning the teeth are fused to the inside of the jaw bones.
The nares can be closed at will, especially to keep away debris or water.
These scales with micropores have glandular structures in the underlying dermal tissue and produce a secretion which may be a pheromone-like substance.
The nominate subspecies is found west of Myanmar, while nebulosus is found to the east.
The subspecies nebulosus is diagnosed by the presence of a series of enlarged scales in the supraocular region.
On the dorsal surface of young monitors, there are a series of yellow spots with dark transverse bars connecting them.
As they mature, the ground colour becomes light brown or grey, and dark spots give them a speckled appearance.
There are 78 premaxillary teeth, 10 maxillary and 13 dentary teeth.