If you will try to look for the global assessment of Desert Monitor (Varanus griseus) in IUCN Red List, you will not find this species, although many other species from this abundant genus (more than 70 species belonging to one genus – Varanus) have been already assessed. This widely distributed species, inhabiting deserts of North Africa, Central Asia and South Asia, is currently split into three subspecies by their geographic areas. The grey monitor (V.g. griseus) occurs in African deserts. The Indian desert monitor (V.g. konieczhnyi) is mainly distributed in deserts of Pakistan and north-west India. The Caspian monitor (V.g. caspius) inhabits deserts of Central Asia and neighboring southern countries: Afghanistan, Iran, Turkey and western Pakistan. In countries of Central Asia: Kazakhstan, Kyrgyzstan, Turkmenistan and Uzbekistan, it is included in the national Red Books as rare species with declining range and abundances.
The Desert or Caspian monitor is the largest lizard in Northern Eurasia: the length of adult specimens from the tip of muzzle to the tip of the tail can reach 150 cm! The Caspian monitor is usually closely associated with large colonies of gerbils (Rhombomys opimus). In its complex burrows monitors find shelters, and the rodents themselves often make up the basis food diet of this predatory reptile. From shelters in search of food, the monitor can go up to 1 km or more. In case of danger, this large lizard may briefly run at speeds up to 120 m per minute. In search of bird nests, monitors, especially young ones, cleverly climb trees and shrubs.
Female-monitor lays up to 20 or more eggs in deep burrows with relatively high humidity. When young lizards just hatched, they are about 25 cm long. The known life span of a monitor lizard is up to 17 years. Protecting from enemies (for example, when people trying to pick them up) the monitor lizard can bite quite a bit. Probably, their saliva contains anticoagulants, as wounds inflicted them bleed for a long time.
In 2012, the herpetologist from the Institute of Zoology in Almaty (Kazakhstan), Dr. Marina Chirikova received a grant from the Rufford Foundation (The Rufford Small Grants Foundation – www.ruffordsmallgrants.org ) for the implementation of project: “Attention! Grey monitor lizard! ”- aimed at studying and protection of this species. As a consultant to this species, I could take part in the expedition to the northern Kyzylkum desert – the main region of the habitat of the monitor lizard in Kazakhstan.
Our expedition began in May from the Shardara regional center, located on the Syr-Darya River near borders with Uzbekistan. From local truck drivers we knew that most recently on a dirt road going to the Bimirza village, they saw several monitors, crushed by cars, and explained how to get there. After driving on this road about 50 km our expedition discovered three monitor lizards, recently roadkill under wheels of trucks. These were large adult specimens, each is more than a meter long. We stopped, fixed coordinates of locations, described the terrain, photo-graphed dead animals, took tissue samples – pieces of the tail, phalanges of the fingers … Perhaps in the future will find partners for genetic analysis of our samples, and on thin sections of tubular bones will determine the age of dead reptiles … Definitely, we were unpleasantly amazed to see in the first day three dead monitor lizards, which are rare and formally protected in Kazakhstan! We were surprised to find all these lizards on dirt, sandy road, where cars moving with low speed. Why so many dead reptiles? We drove up to the camp of livestock breeders, began to communicate with local residents and found out that often the monitors are crushed by cars on purpose. Many people, as it turned out, traditionally believe in prejudice, believing that this large lizard can suck goats and sheep milk, brings misfortune, and if he runs between a man’s legs, then this person will remain childless… All these circumstances cause persecution of the monitor lizard by people.
Monitors often move along dirt roads, probably here they find more prey or scavenging on small roadkill animals. One such “hunter” or “scavenger” walked towards our car. When he spotted us, he turned and ran the other way. But he did not guess to move from the road and go into the sandy dunes. When the distance to the car catching up to him is reduced up to 10 meters, the lizard turned to our side and took the aggressive pose, maximally swelling and hissing, threatening large enemy…
Exactly so – face to face – fearless monitor lizards for hundred thousand years met their enemies – four-legged and feathered predators. And often the enemy retreated, not daring to attack on a formidable dinosaur armed with sharp teeth. However, against a man driving a car such a success tactic does not “work”, especially if this man since childhood does not like and is afraid of the “horrible” lizard. That’s the main reason why these rare animals are threatened: one hand, hostility to them by the local population, on another hand, this is a behavior stereotype of monitor lizard… Of course, small monitors are hunted by many desert predators, like any lizard. But large adult monitors do not have enemies except for man.
The most vivid impression of this expedition again was related to the negative impact of man, although this time it ended well … Near the northern border of the monitor lizard’ habitats, which almost coincides with the border of Kyzylkum sands, we met with a group of zoologists from Kyzylorda anti-plague station. Zoologists told that they usually see this large lizard 5-6 times per season. But this time, they found the monitor recently in an old, dry well, located at the abandoned camp of livestock breeders. Our expedition went to the mentioned place and found still an alive monitor in a narrow well with a diameter of two meters and a depth of about 4 m.
It took some time to save the monitor, because he made several holes inside and did not indent to communicate with “scaring” people. However, we found ways how to capture him and take out from the well, where this lizard could die after while without food. We watered the saved monitor lizard – poured into it one and a half cup of water, because the animal was dehydrated. However, the monitor id not look very exhausted: in the well, we found the remains of a hare – a skin and a skull. Apparently, hare fell into the well and became the food of the monitor lizard. Obviously, the monitor fed up by falling down bugs, lizards and other small animals … It was a really large specimen – a female, 126 cm long. According to literature, maximal sizes of monitor lizards in Kazakhstan reach 130 cm, in Uzbekistan – 150 cm. However, local people said that they observed larger specimens.
We released the saved lizard away from the dry well, so that this monitor does not fall there again. By the way, after sitting half-hours in a bag and having been in the hands during the measurement process, the monitor calmed down, his aggressiveness greatly diminished, and before liberation, he thanked us with a good photo-session. We wished her reproductive success in the continuation of the ancient line of this unique lizards, still inhabiting deserts …
During the expedition to Kyzylkum, in addition to the monitor lizard, we found other species such as a green toad, two species of geckos, three species of toad-agamas, steppe agama and Central Asian tortoise. All these animals, even small turtles, serve as potential food of the monitor lizard.
According to preliminary assessment, in southern Kazakhstan the remained stable population of Caspian monitor accounts, at least, several thousand individuals. Key species habitats are located in the southern part of northern Kyzylkum desert near borders with Uzbekistan. The main causes of the population decline are the death of monitor lizards under the wheels of cars on numerous dirt roads, covered Kyzylkum by dense network.
Obviously, there is a need to preserve the remained habitats of this rare and vulnerable animal, increasing protected area network in the Kyzylkum desert. There is a need also in a public awareness campaign that to change the attitude of the local people to desert animals. Basing on collected materials and photographs, taken during expedition, we printed a colorful poster and pocket calendars with a portraits of monitor-lizards and disseminated them in schools.
More information about the project “Attention! Caspian monitor lizard! ” can be found on the website telling about Herpetofauna of Kazakhstan, created by colleagues from Almaty. Naturally, in one year it is impossible to solve all problems associated with the protection of the Caspian monitor. Therefore, we continue to work on study and conservation of desert wildlife in Central Asia. We hope to achieve the good results in the protection of desert wildlife and this unique lizard through cooperation with national authorities and local people.