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Bengal monitor

life science Maturity 5-7 Next article →

The Bengal monitor, known scientifically as Varanus bengalensis, is a large lizard found across the Indian subcontinent.

SL Bundala NP asv2020-01 img22
SL Bundala NP asv2020-01 img22

It is also called the Indian monitor. This species is one of the most widely distributed monitor lizards in the world. Its range stretches from Iran in the west to Java in the east. These lizards inhabit many different environments. They live in river valleys and dry, semiarid deserts. They also live in moist forests. They generally prefer areas with large trees and high ground cover.

Varanus
Varanus

Physiologically, the Bengal monitor has several specialized features. Its lungs contain spongy tissue rather than the sacs found in other saurians. This structure allows for a greater rate of gas exchange. Because of this, the lizard has a faster metabolic rate and higher activity levels. It also possesses a forked tongue, similar to a snake. This tongue is used for sensory purposes rather than moving food. The lizard has subpleurodont teeth, which means the teeth are fused to the inside of the jaw bones. They are also polyphyodont, meaning they grow replacement teeth. About four replacements occur for each tooth every year.

Monitor lizard image
Monitor lizard image

There are specific details regarding the teeth and scales of these lizards. The teeth consist of 78 premaxillary teeth, 10 maxillary teeth, and 13 dentary teeth. The maxillary and dentary teeth are laterally compressed and sometimes have a serrate cutting edge. The premaxillary teeth are conical. The skin features scales that are rougher in certain patches. In males, these scales often have minute pits or micropores. These pores are connected to glandular structures in the dermal tissue. These glands produce a secretion that may act as a pheromone-like substance.

Taxonomy helps scientists understand the relationship between different monitor populations. The Bengal monitor is part of the V. bengalensis species complex. Populations in India and Sri Lanka have different scalation than those in Myanmar. These were once considered subspecies but are now viewed as separate species within the complex. The nominate subspecies, V. bengalensis, lives west of Myanmar. To the east, you will find the clouded monitor, or Varanus nebulosus. You can tell them apart by the enlarged scales in the supraocular region near the eyes. The number of ventral scales also varies by location, from 108 in the west to 75 in Java.

Common Indian Monitor or Bengal monitor Varanus bengalensis Karnala Maharashtra (2)
Common Indian Monitor or Bengal monitor Varanus bengalensis Karnala Maharashtra (2)

The appearance of the monitor changes as it grows. Young monitors are more colorful than adults. They have dark crossbars on the neck, throat, and back. Their bellies are white with dark bands and grey or yellow spots. On their backs, they have yellow spots connected by dark bars. As they mature, their ground color becomes light brown or grey. They develop a speckled appearance from dark spots. Males are generally larger than females. Heavy individuals may weigh nearly 10 kilograms.

Behavior and survival strategies are central to the life of a Bengal monitor. They are diurnal, meaning they are active during the day. They often become active around 6 AM to bask in the sun. They are usually solitary animals that live on the ground. However, young monitors are often seen in trees.

Dulip Wilpattu Python1
Dulip Wilpattu Python1

Adults are capable of rapid movement on the ground and can climb well. They are also excellent swimmers and can stay submerged for at least 17 minutes. They are generally shy and avoid humans. Their eyesight is very keen, allowing them to detect human movement from nearly 250 meters away. They find shelter in burrows, rock crevices, or abandoned termite mounds.

Dada Panchal with monitor lizard 6 x 4
Dada Panchal with monitor lizard 6 x 4

The diet of the Bengal monitor is very varied because it is a generalist. They eat many types of invertebrates, such as beetles, larvae, scorpions, and ants. Larger adults also eat vertebrates. This includes fish, lizards, snakes, rats, and birds. They even scavenge carrion, which is dead animal meat. Their reproductive cycle involves females digging nests in level ground or vertical banks. A single clutch contains about 20 eggs. These eggs hatch between 168 and 254 days after being laid. The species is currently listed as Least Concern on the IUCN Red List, though populations are decreasing due to hunting and pollution.

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🖼️ Images & Media (7)
File:Sigiriya 2017-10-18 (5) (cropped).jpg
Sigiriya 2017-10-18 (5) (cropped).jpg
File:SL Bundala NP asv2020-01 img22.jpg
SL Bundala NP asv2020-01 img22.jpg
File:Dulip Wilpattu Python1.jpg
Dulip Wilpattu Python1.jpg
File:Common Indian Monitor or Bengal monitor Varanus bengalensis Karnala Maharashtra (2).JPG
Common Indian Monitor or Bengal monitor...
File:Monitor lizard image.jpg
Monitor lizard image.jpg
File:Dada Panchal with monitor lizard 6 x 4.JPG
Dada Panchal with monitor lizard 6 x 4.JPG
File:Varanus.jpg
Varanus.jpg
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