Monitor lizards are a group of lizards belonging to the family Varanidae. There are over 70 species that differ only appearance seem all seen each other greatly in size. There are about 75 species of lizards which are included in all of the genus Varanus. The type number is regularly increased from new discoveries. Monitor lizards are found in parts of Asia, Africa and Australia. There are several extinct species of lizards known who lived in Europe and North America, but it is then no dragons but only recently evolved species have long been extinct and only as fossils are known. Monitor lizards are mostly carnivorous or meat eating, many species feed on insects and small vertebrates. Some species are known to also plant parts are eaten like berries. Important enemies of dragons are consuming larger mammals and raptors. Man plays by the destruction of the natural habitat a negative role. By making suitable living environment for agricultural activity, the distribution area is getting smaller. Monitor lizards are the largest representatives of the lizards, the best known species is the Komodo dragon, which can be about three meters long. Because they usually are very large are the dragons in the audience also known as 'primitive' because they are reminiscent of the oerreptielen. However this is a misconception, the lizards have a highly developed group of reptiles that have adapted to different circumstances.