Thailand is home to a vast range of reptiles and amphibians. Although still persecuted by many, the country´s reptiles are an essential part of the food chain and play an important role in the control of pests such as rats and insects. Some 176 species of snake have been identified in Thailand, ranging in size from 20cm for the common blind snake to 10 metres for a fully-grown reticulated python. Three species of tortoise inhabit the country. The largest of these, the Asian giant tortoise may exceed 40kg and live for more than 100 years. Although much disliked by Thais, the monitor lizard is still fairly widespread. The largest, the giant water monitor, can exceed 2m in length and weigh more than 50kgs. Many other species of lizards are found in Thailand, including the amazing gliding Draco lizards which can sail significant distances from tree to tree.