Medical leech east – Hirudo medicinalis orientalis. This species has a dark greenish color along the back – narrow orange stripes, covered with evenly spaced black spots quadrangular.Abdomen black with green spots, arranged in pairs at regular intervals. This kind of leech can not be used because it is not diluted in artificial conditions. For many centuries, biologists, doctors, healers look into the body leech, to understand what is the secret of the use of medicinal leeches as a remedy: “How does a leech that inside her?” This issue includes the physiology of its digestive system, the composition of salivary gland secretion and some other questions that open up are not privy to the life leech reader the secret of her invaluable. Everyone, even the ignorant man in biology leech is obvious that she has a front and rear part of the body. In the Great Encyclopedia of public information on all branches of knowledge said: “The real heads of leeches no mouth is on the front end of the abdomen and leads to muscular pharynx, which is equipped with three jaw plates with teeth protrude or trunk. The throat should intestine, having the form of a straight tube, followed by the rectum is short, opening up the rear sucker anus. Numerous glands under the skin secrete mucus, while the deeper located the so-called “chitin” glands secrete a viscous, clear and fast curing body is a secret. ” As is well known to every reader, leech living off that feed on the blood of other living beings. This may be the person who turned in a pond inhabited by leeches, cattle, horses’ frogs, fish, poultry slow, which do not have time to fly away from the rapid leech, aims to warm the body of his victim. In bloodsucking leeches act usually takes about an hour, after which they leave their tasty host and live in a free state. The wound from the bite, as you rightly know, can not cause the cow, horse or get to tired watering sheep big trouble. On the contrary, the leech itself without knowing it, these animals have a service redeveloped their bodies. But the attack on small animals can deprive the latter of life. Leech is able to drink the blood three times its own weight. Now imagine this useful bloodsucker who has stuck to a gosling. What will happen after such a gosling “wellness session”? Most likely, he would die from blood loss.Therefore, scientists and leeches are classified as ectoparasites and predators. Just like most living things, the leech has an amazing ability to adapt to everything that surrounds it. The purpose of adapting its one: plenty to drink someone’s blood, get yourself a new, tasty and nourishing power supply. We can say that all the centuries-old evolution of leeches – is the process of the emergence of the relevant authorities, which have helped them adjust to the specific conditions of life, in particular, to a method of obtaining food. The method of obtaining food from leeches can be divided into two stages. The first stage is characterized by the appearance of morphological features of leeches. Second – physiological changes. Scientists have found that the first of these animals changed and developed morphological features: they have formed a sucker, located on the front and rear ends of the body. With suction cups leech could conveniently and easily fixed to the body of the host. Then changed physiology: digestive system began to provide large amounts of blood absorption and slow digestion.