The descendant of one Holocene species of marsupial mice, tiny (the total body length is no more 10 cm, not including short tail) species of predatory marsupial mammals, had developed the unique habit of life combining predating with original kind of parasitism. It lives in places where many species of large marsupials live, and spends a part of life, parasitizing in their brooding pouch. This animal penetrates into pouches of large marsupial mammals and eats still tiny newborn cub bearing by them. Then adult animal is attached instead of it to the nipple and feeds on milk secreting by the female involuntarily becoming the host of parasite. This animal is named filicide embryotherium. At embryotherium many infantile features are kept in appearance. The skin of this mammal is covered by thi