Platypus - a relatively conservative family of mammals. Dwell in Obdurodon Miocene - it is almost the same platypus, wherein a massive physique and presence of teeth in its beak. In human epoch platypus suffered from persecution by humans, but due to lack of competition, were able to quickly restore strength when they were protected. In Neocene, surviving the global environmental crisis, platypus have evolved into new species. In the lower reaches of the rivers for fish hunting predatory mergotery and his cousin lives in cool mountain rivers. This descendant of the platypus called antsistrotery - by way of eating is very similar to the South American catfish Ancistrus, although eats a few other food.

Antsistrotery, unlike its counterpart among fish, not broken with the same power character: like its predecessor the platypus, it feeds on aquatic invertebrates. But the foundation of his power - a variety of small animals, attached to the rocks. It is the larvae of midges and other insects, small snails and leeches, as well as the eggs of fish and snails. Especially the animals are abundant in mountain streams, so antsistrotery, mastering this food source, had to adjust to a cooler climate.

Antsistrotery - small animal compared with the ancestors: it is only the size of a large rat. Outwardly, it looks like a platypus, but the main difference is in the structure of the beak. This beast upper jaw more arched, the lower slightly shorter than the upper. On the edge of rolling antsistroteriya language grows horn fringe - with the help of her animal scrapes with stones feeding organisms. To stay on current animal palm turned into a kind of suction cup: palama turned into a narrow circular rim. This beast can stick to smooth stones, keeping on the course. On paws the animal also developed long claws: with their help, he clings to the rocks and in burrows under rocks and cliffs. Entrance to the hole carefully masked. In addition to the hole, in the territory of each animal there are several temporary shelters.

In cold climates antsistroteriya wool has become more thick and dense. small animal spends a lot of time taking care of her. It cleans and lubricates the hair claws its secretions from glands near the cloaca. Due grease wool hardly wetted and floating under water seems silvery beast. antsistroteriya Wool gray head is a dark (almost black), on the chest and chin is white spot. Hands and feet, without hair, covered with dark skin. The claws on the front legs are long, white. Sensitive animal beak is covered with an elastic light gray skin.

Having mastered as a specific food source, an animal had to change the behavior. Antsistrotery become very territorial and quite aggressive animals. He banishes from his site not only relatives, but even fish. If the shocks are not in the side, animal beak nipping fish of fins and gill covers. Outside the breeding season relatives expelled from the aft section of the same determination, and only in the mating season males females admit to its territory, but banish them immediately after mating. Demonstrating their rights to land, the beast gets up on his hind legs, and demonstrates stranger white throat, visible from afar. It also demonstrates the power, loudly splashing water while diving. If this does not work, it attacks the enemy, and expels it by force.

Twice a year the female lays antsistroteriya in a hole three - four small balls (about the size of a sparrow), and incubates them for about ten days. At that time, life processes are slowed down at it, and the blood flows primarily to the portion of bare skin on the abdomen, where the eggs are placed. During the incubation period the female is only 2 - 3 times leaves the clutch to feed. Cubs are about two months in a hole. During this time they grow up enough to learn how to survive on their own. The first time the female feeds them milk, then bring in the cheek pouches insect larvae, accustomed to adult food. In young animals on his chest no white spots, it appears only at the time of ripening. These animals become adults aged six months, and overall survival is they have no more than 6 - 7 years.